Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5d903276edcbc2…

MALICIOUS

PDF

45.1 KB Created: 2020-08-15 18:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6217c7aa35acd78a81b0bcee5e183c SHA-1: a761be341a63b8ea9a28ff91cf6095f3f67d7bb2 SHA-256: ce5d903276edcbc285716c95fccb0d9897272458374c8c5492b3718730e2f707
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a 'Calvin Klein jeans shoes size guide'. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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=calvin+klein+jeans+shoes+size+guide
    • http://files.shanehagedorn.com/uploads/1/3/1/6/131606727/4527229.pdf
    • http://files.shepherdoflife.org/uploads/1/3/0/9/130969645/rawasuxamujezipup.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/runurujuxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/60534970172.pdf
    • https://cdn.shopify.com/s/files/1/0436/4481/3470/files/xorux.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/chef_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3603/2680/files/nivibidijerori.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/xomod.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/89564053560.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/mortal_kombat_9_android_game_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/boxesi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/adjetivos_en_ingles_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1112/files/76475735277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/vepasokamifezaxo.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653d.bin
c4bd792364bb0686def049a1604683d108acb82378227b5bf85796db9454b665
pdf-font-stream PDF embedded font (sfnt) at offset 0x653D 5068 bytes
font_01_sfnt_off00007685.bin
7cd7e1a25cb9685c8e4f636d01b2acb982c0e8789fbd4cfd9af1d3cdbeaf91bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7685 10120 bytes
font_02_sfnt_off000098f0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x98F0 4324 bytes