Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d2921e8444cc9e…

MALICIOUS

PDF

38.6 KB Created: 2020-08-05 17:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3312ba8f72597f290325d8bca6a6954a SHA-1: f1f32d127aa3bf09bfddbfebf26d0ad1c892a66d SHA-256: 22d2921e8444cc9edd997a9e0812cb01821d13fa4be063d15357218dfc6c8efa
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=anthropological+linguistics+an+introduction+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also 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.cc/pify?keyword=anthropological+linguistics+an+introduction+pdf
    • http://barupo.suzannedcorsey.com/uploads/1/3/0/8/130874655/demosujebul-ridujopikolakor.pdf
    • http://lusagir.potofgreenflorist.com/uploads/1/3/0/7/130775169/tovosemi-zikazi-pumujaxe-ribawanovewaf.pdf
    • http://files.rebekahmallen.com/uploads/1/3/0/7/130739265/pukavapedozakivaromu.pdf
    • http://files.offthepier.net/uploads/1/3/1/3/131398140/zufogokajewatazodizo.pdf
    • http://dowesexaf.kierstenmodglinauthor.com/uploads/1/3/0/7/130739024/bavil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/38653642009.pdf
    • https://cdn.shopify.com/s/files/1/0429/4223/4791/files/dotekipuwobarijifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/xisebo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2694/5947/files/chemistry_4th_edition_gilbert.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/vapour_compression_refrigeration_system_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/curtis_ryan_honda.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/farew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/kafemidunogeniwido.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/vipuxodizenuriwanako.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/1402984612.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/mudimamalogev.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/36252147115.pdf
    • https://cdn.shopify.com/s/files/1/0431/9923/4203/files/zikopamazemamazor.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000594f.bin
ab1190b5a7eea2353f1f8e46bcaaf5665d79f97657f538bf9188199e662ddb60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594F 5408 bytes
font_01_sfnt_off00006baf.bin
d9dadea38d9c889520477a244caf5fdb459617384e602594eab3762f7a54c21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAF 9844 bytes

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