Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bd7872bbdfb2ee…

MALICIOUS

PDF

38.7 KB Created: 2020-08-12 13:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3bcf19e62ee8a1922dafbf75d367c0 SHA-1: 4a7d12ca14016b0266a1bfed5f53238c2c5075fb SHA-256: 75bd7872bbdfb2eeef06d8ef1787023f5db6b8a98952210a19d6a1765872d1ea
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious due to its inclusion of a large number of external links, many of which point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to lure users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect users to malicious 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=acronis+backup+12.+5+standard+pdf
    • http://files.skski.net/uploads/1/3/1/4/131453904/25cef2893e82b.pdf
    • http://files.free2code-initiative.eu/uploads/1/3/1/4/131407572/36810294131378a.pdf
    • http://files.electricotterdesigns.com/uploads/1/3/1/3/131380045/7aa38.pdf
    • http://files.sjsyndrome.com/uploads/1/3/2/6/132681901/6280815.pdf
    • http://files.daniellewestdyk.com/uploads/1/3/1/4/131437636/gituse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/35370671356.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/nidawovexem.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/zorezutubesosazof.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/gopejisusamifakuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/dujaruvaviduzenovuvexiwal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/sizufogolup.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/criminal_law_book_2_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/pesebejota.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/manager_are_born_or_made.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0659/files/base64_encode_file.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/april_fools_spelling_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/50365846683.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_off000057f9.bin
6e64252c2489bcc2b6ede8074ca4a4cab1198d40fad1cba3399953ac0f139ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 5648 bytes
font_01_sfnt_off00006b44.bin
ecc55f1480b376405fdd4ae817382eb657acd56a9a6c95d5d9fba7090f219906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 10184 bytes

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