Malicious PDF — malware analysis report

Static analysis result for SHA-256 c860cdaa68c8f882…

MALICIOUS

PDF

48.3 KB Created: 2020-07-19 21:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 56b9853b6171620f984a5713e8eaad1b SHA-1: 8c894d86d753b868564726d2542f6f8e37b43f58 SHA-256: c860cdaa68c8f882cae387e91df5e27131f20411b176c84cd98fd0b054e21f78
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious websites. One of the primary links points to a known malicious redirector infrastructure. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure beyond the malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.ru/wb?keyword=dionaea%20muscipula%20cuidados%20pdf In PDF document text
    • http://files.deathcog.com/uploads/1/3/1/4/131452880/1f70fc003d7c.pdfIn PDF document text
    • http://files.tatiromo.com/uploads/1/3/1/8/131859993/34d773e38c9b53.pdfIn PDF document text
    • http://files.escapeologists.com/uploads/1/3/2/6/132681026/vuxawaxigajipojudu.pdfIn PDF document text
    • http://files.fuelforthebody.net/uploads/1/3/1/4/131453127/ridilekapoge-silazukegebuwef-pakusejawuxoje.pdfIn PDF document text
    • http://files.lacenguyen.com/uploads/1/3/0/7/130739699/xewupojixukifugikaki.pdfIn PDF document text
    • http://files.livethebelife.com/uploads/1/3/0/7/130775760/tajuxixipado-vitoxojuwifa-zezunu.pdfIn PDF document text
    • http://files.gavthegothicchav.com/uploads/1/3/1/4/131482950/7051636.pdfIn PDF document text
    • http://files.freshairfilms.us/uploads/1/3/1/4/131452826/7e5c04d19a7b087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rewerubar.files.wordpress.com/2020/06/xujajis.pdfIn PDF document text
    • https://nesogisomabe.files.wordpress.com/2020/06/zokofuzukewativasu.pdfIn PDF document text
    • https://fajadofavano.files.wordpress.com/2020/06/sagakewebajusiwijesopagos.pdfIn PDF document text
    • https://sepozux.files.wordpress.com/2020/07/mujurozigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/24185765427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/67814515937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/wakalurefenokubato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/86099367574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/wewopave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/puzikalowivuzanopu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D74 5008 bytes
SHA-256: 63c9de9a4cceb14cf7a27cd17e99757f5cfb696412af187491c67c52e9911b5a
font_01_sfnt_off00008e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E65 11000 bytes
SHA-256: 7eaa3acf9eff4050c288c41238efd046f384a9772735843ee3e868bbec963e3b