Malicious PDF — malware analysis report

Static analysis result for SHA-256 1877fe80fb0107f0…

MALICIOUS

PDF

44.9 KB Created: 2020-08-11 07:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258f8e17b61f0d611a8f87358f906c77 SHA-1: ef2afbcfa65584e22164f42961b76548c6478845 SHA-256: 1877fe80fb0107f025c72a556e20c0be692101c40437e4c2127ba95aa75f31fe
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, contains text suggesting a lure for a dictionary download, and the embedded links likely lead to further malicious content or malware. The presence of multiple Shopify URLs, some benign and some unknown, suggests an attempt to blend malicious links with seemingly legitimate ones.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=cambridge+english+dictionary+free+download+full+version+pdf
    • http://nupajuwof.bethlehem-morristown.org/uploads/1/3/1/3/131381679/4c93f1b46aead.pdf
    • http://vatozib.littlegemskaren.co.uk/uploads/1/3/1/4/131453177/zitorunegaretotawi.pdf
    • http://jabimege.collinssarsfield.com/uploads/1/3/1/3/131383377/nakotomewibadin-bafuxus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/66473563044.pdf
    • https://cdn.shopify.com/s/files/1/0454/2945/7064/files/mtodo_de_la_ovulacin_billings.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/zepotamix.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/mapamundi_con_nombres_a_color.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/laruwivixureliziw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/73700560467.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/taduzili.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8832/files/87462378656.pdf
    • https://cdn.shopify.com/s/files/1/0433/6694/0828/files/intermediate_algebra_9th_edition_bittinger.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/49235927198.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/20152897114.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_off00006f52.bin
4e89a15d5700100d68a1ff1601857e8cc0bfaaa160d1717d787dea265ad1fe38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F52 5868 bytes
font_01_sfnt_off00008336.bin
ef31dd6c0f502038b2a42be1ab3b7dd2338f2ac964f89a7e543ddca02cd65324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8336 10352 bytes

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