Malicious PDF — malware analysis report

Static analysis result for SHA-256 211c623a287faab6…

MALICIOUS

PDF

44.1 KB Created: 2020-07-14 22:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: dc5ae0d2c1d444a3650180471d76ebc0 SHA-1: fe546cb08af419bb5239e05079be3075374581e9 SHA-256: 211c623a287faab650326f2749d1cc9477be64030d07ff8201a50395a23d57e9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded external links, a technique often used to create link farms for SEO poisoning or to host phishing lures. One of the primary links points to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for delivering malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=electre%20method%20pdf In PDF document text
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdfIn PDF document text
    • http://files.rollingroses.com/uploads/1/3/1/0/131071137/dapix_putej.pdfIn PDF document text
    • http://files.karazhang.com/uploads/1/3/2/6/132683224/2af13d014f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/romixaxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/36546380247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/27881765200.pdfIn PDF document text
    • https://xazuremi.files.wordpress.com/2020/06/seladur.pdfIn PDF document text
    • https://zefumonale.files.wordpress.com/2020/07/20816974629.pdfIn PDF document text
    • https://selijowo.files.wordpress.com/2020/06/53025050875.pdfIn PDF document text
    • https://megazotawulo183772260.files.wordpress.com/2020/06/32380664673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/31439601348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1188956193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/fanod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/fabedododitaxikawepot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4877/1488/files/68445474763.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_off00007091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 4600 bytes
SHA-256: 5fe9cdb457e1912a4a1af4651c3e54677e05246c7917cdf6557df48faf3645b6
font_01_sfnt_off00008032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 10308 bytes
SHA-256: bb4ee7995bb54e5ccd8dd4e3e02b7b3bc25b2fd8c5a515ef4135310a39e83f3e

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