Malicious PDF — malware analysis report

Static analysis result for SHA-256 729d49ef3334b561…

MALICIOUS

PDF

62.4 KB Created: 2020-08-23 06:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8712e7759b05d8977fbb150ff8f89b56 SHA-1: b24b7675aee601d13039d87cc1dbb4e65ad40528 SHA-256: 729d49ef3334b561a71da8b852646b92f3ddeddeb784698cfff9c553a3a962dc
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to SEO link farms designed to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=applied+maths+1+book+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a similar URL, suggesting the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=applied+maths+1+book+pdf
    • http://xexux.ishootuk.com/uploads/1/3/2/6/132682883/2220323.pdf
    • http://panefotop.highrollerproshop.com/uploads/1/3/1/3/131383284/da4ef38f86e288.pdf
    • http://files.limitedrangearrangements.com/uploads/1/3/2/7/132741241/rejetupatuba_ropom_wadafudomewaku_jewol.pdf
    • http://files.spotlightseniorservicesnorthernarizona.com/uploads/1/3/0/9/130969545/f852325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/dizimosimitopejol.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/lekilefitow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/nervio_ciatico_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/94433305757.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5653/files/chori_chori_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/81951104933.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/bourne_supremacy_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/21939079395.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/digitech_rp360xp_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/95004582135.pdf
    • https://cdn.shopify.com/s/files/1/0429/1955/9335/files/99051688938.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_off0000b576.bin
b20ae1460db9c171673a36d0e588e7dc634aa48f9ab97f15a2a35cbc7aa4df39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB576 5428 bytes
font_01_sfnt_off0000c7cf.bin
0f931d0f572f6ba76ac9f0665a132e4d917b4e484ca27acc2cbb87d534c77303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 10676 bytes

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