Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fbd41a780a869a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-11 15:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fd0c80e6bbed3dc146805d5fe213033 SHA-1: 4ea8364b4046acdd9dce79123622f7ccbda22388 SHA-256: 81fbd41a780a869a88f5b4817cca5546867708efc9da2a0c9776e15f52a53c82
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a document about email etiquette, but analysis reveals it points to malicious redirector infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, likely used to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=email+etiquette+in+the+workplace+pdf
    • http://files.guitarsam.com/uploads/1/3/1/4/131452804/4155559.pdf
    • http://wesobiwi.musicatozpodcast.com/uploads/1/3/1/4/131453541/bisojudiduvu.pdf
    • http://files.d7motorsports.com/uploads/1/3/0/9/130969357/sagepuluwerewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/sasidisuxekafawugubanar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/90072602432.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/42948420749.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/90131014676.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/94808161437.pdf
    • https://cdn.shopify.com/s/files/1/0440/0598/2366/files/mevaposijozoluxezelo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/wesilufimonafuxofiruxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/vopemajebuwigolak.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/voduzebomewunewimi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/pisiliwajumefenufapado.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/45583648064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006be6.bin
ef3ca3101503e8b1c174fb5a96fff6a80b0dd038e83bedca1c4ddfc23f8a92ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 5456 bytes
font_01_sfnt_off00007e57.bin
0059661a22c044e22b97d5ddddbd10b750bd06aa40692882dedd92a1e3e3d1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E57 10308 bytes

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