Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef505c048e21a0f…

MALICIOUS

PDF

40.6 KB Created: 2020-08-12 08:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959dab4532a5ee05f68a638c31c5bac1 SHA-1: 83f0a7e59b1f2af63fd75c62cf7a7a2d71273ab8 SHA-256: 0ef505c048e21a0f6ef221a311c539295862fbd3726ad839a8bdd219b8cf153f
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, including a critical redirector link to 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains references to educational materials and URLs pointing to Shopify, likely as a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

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.ru/pify?keyword=accountancy+class+12+ncert+book+pdf
    • http://files.sthlmtapas.se/uploads/1/3/2/6/132695200/73172.pdf
    • http://vemixofa.deesdoings.com/uploads/1/3/1/6/131637814/ketanawegemutidoj.pdf
    • http://files.dreyfus-emerson.com/uploads/1/3/0/8/130874238/7896870.pdf
    • http://files.mayaoffprice.com/uploads/1/3/0/7/130740477/benogepepusu.pdf
    • http://lidufug.pluckersworld.com/uploads/1/3/1/0/131071164/feruloreruvutemapidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5781/4431/files/tv_interview_script.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/goxefetorijuvovoret.pdf
    • https://cdn.shopify.com/s/files/1/0439/4971/9720/files/canon_in_d_easy_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8483/files/airbus_ata_chapters.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/zizatalatezoximabikur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/93105794829.pdf
    • https://cdn.shopify.com/s/files/1/0428/9409/8598/files/56490242660.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/79992317479.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/ruzuxaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/pusepagotekizitezepofi.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_off00005ff1.bin
9a336e633cdbf5ff0ccb549811e3a7e1496658b2aaae86ca3713d26c1027e1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF1 5628 bytes
font_01_sfnt_off00007332.bin
fd24faf4f02f6153fd502d4ad90dfc0c38786a57e58a706f88dbef6653444f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7332 10272 bytes

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