Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ff9af521f96727…

MALICIOUS

PDF

48.3 KB Created: 2020-08-23 23:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2de4d9e0a91d310897d2a934de159db7 SHA-1: e70cc11fff5f664ab5f3a856dde2ad6bd349ed57 SHA-256: 73ff9af521f967271a53965113fe8db302d4e0f4ea4a2766bb26ae6c95b5b09f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body and embedded links suggest a lure for software downloads, specifically mentioning 'Calibre windows 8.1 64 bit free'. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm strategy to improve SEO for malicious content. 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=calibre+windows+8.+1+64+bit+free
    • http://woluv.rotarygallop.com/uploads/1/3/1/4/131453555/xizujufufirevor.pdf
    • http://files.touchvt.com/uploads/1/3/1/6/131606059/706bb.pdf
    • http://jetogi.mandydickson.com/uploads/1/3/2/3/132303382/kivabizib-juzadurujepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/82214367735.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/umbilical_granuloma_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/amar_asom_news_paper.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/widelilizajegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/mofelegofodazi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/9766556569.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/losetofovevepoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/candle_making_machine_price_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/dovipoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/anglais_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/creation_story_worksheets_for_youths.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662b.bin
d071fb1b0cb77eeec338aed09976200613e5f7fd6ac1b662e7af75e3b7ba227d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 5464 bytes
font_01_sfnt_off000078e5.bin
ebcbcbe9283fdc2ea18ff9737574c67133ce800f2cd2f4e41b92c3dd5e1497fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E5 14448 bytes
font_02_sfnt_off0000a657.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA657 4324 bytes

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