Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bad2473afaea80…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 04:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62dfc047896ea8c80566a019fa309a0d SHA-1: 1918eb96d826f566666ec65a4b3efb649a9ec4d4 SHA-256: 75bad2473afaea8033b7f242487bc60d0b597d019c230deecafa9d1fb702bfda
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate SEO traffic. One of these links, https://ttraff.com/pify?keyword=add+blank+page+into+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to adding blank pages to PDFs and references wkhtmltopdf, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=add+blank+page+into+pdf
    • http://files.maureenpersonsart.com/uploads/1/3/1/1/131164270/4264427.pdf
    • http://files.lamochaboutique.com/uploads/1/3/1/4/131438114/xinalumigaxap-fuletoriwig-juzewesodomose-purivubulaxikux.pdf
    • http://files.westminstermedicalclinic.com/uploads/1/3/0/8/130874474/1112489.pdf
    • http://files.thepetrospective.com/uploads/1/3/1/4/131483209/lerexofopekufus_sabuxulu_jixiwepi_nuzowazofozukov.pdf
    • http://files.ladypatriotssoccer.com/uploads/1/3/0/8/130874197/zafetuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/vukusevasuwel.pdf
    • https://cdn.shopify.com/s/files/1/0451/0574/1989/files/jang_newspaper_15_september_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/alan_turing_notebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/xuzigemalebujew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/45279703898.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/gloomhaven_rulebook_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/70285387546.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/fevizavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/71222658027.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6549/files/tikobuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/50784398787.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/salarokarafuzafajad.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_off00006bbe.bin
224d14f0aa0706b72cfba730da6a7fec9bda1ce693b284bcaca95e4ed429f386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 5128 bytes
font_01_sfnt_off00007d4b.bin
421430925b3c444152db589ef50769d28c176e18dff70ba7ec2c4791a544d71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4B 10084 bytes

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