Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95ea6f095589564…

MALICIOUS

PDF

53.0 KB Created: 2020-07-19 05:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: fc9c2437fed11e3173e7396662a45d6d SHA-1: ca99eec925eb985e682094fa2ef4176e8c9002fb SHA-256: c95ea6f095589564fc36df3f1b6fe33aee7e5644637747f404604ce11a6d1794
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates that these links lead to a redirector known for malicious activity. Another heuristic flags the document as a link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The presence of a visible LOLBin execution instruction further supports the malicious intent, likely to execute a payload or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=escribir%20en%20tercera%20persona%20pdf In PDF document text
    • http://files.255alhambra.com/uploads/1/3/1/4/131452938/towugezeve-dujozuravoj.pdfIn PDF document text
    • http://files.customerfocusedlearning.com/uploads/1/3/0/7/130738814/bavajesapamukogobos.pdfIn PDF document text
    • http://files.prrofe-olmos.com/uploads/1/3/1/6/131606115/3752455.pdfIn PDF document text
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdfIn PDF document text
    • http://files.cmd-cn.net/uploads/1/3/0/7/130738534/199230.pdfIn PDF document text
    • http://files.iscebs-richmond.org/uploads/1/3/1/4/131453250/kutejilepuju_zubalimuxugexaf.pdfIn PDF document text
    • http://files.etudist.com/uploads/1/3/1/4/131452840/a5353ab.pdfIn macro / runtime command snippet
    • http://files.believeitornotphotography.com/uploads/1/3/2/7/132712199/fepebedawog-kutosu-lanakeputirire.pdfIn PDF document text
    • http://files.lakesiderockers.com.au/uploads/1/3/2/7/132710628/9407265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jurikebigox883042776.files.wordpress.com/2020/06/xumamigamolozox.pdfIn PDF document text
    • https://bijixod.files.wordpress.com/2020/06/pimuvizipesoluvejijoki.pdfIn PDF document text
    • https://texamepup.files.wordpress.com/2020/06/23617070446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/daratigitikisejezifike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/75336897759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/49181888817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/vibipibota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/libomagosekifen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/6803496300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/gogabover.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/9476996501.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA8 5004 bytes
SHA-256: dc72f8d75448f82ca173993f6e441ea85b69b9a1853e301b1cce2aff537181af
font_01_sfnt_off0000a09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09A 11248 bytes
SHA-256: 05caa1c64c6ac209b953ae4450f72656b0805f89a0d6672255f61125fb2a5e54

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