Malicious PDF — malware analysis report

Static analysis result for SHA-256 092b74a2571597ec…

MALICIOUS

PDF

46.1 KB Created: 2020-07-29 18:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 111ffe1b759032ed286d74bc36b046b1 SHA-1: 30e2920a990dc380d15f3343d929623122066286 SHA-256: 092b74a2571597ecdadbc2c56b07c397a8f5dc7497a2d06b732ad13bb949f557
154 Risk Score

Malware Insights

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

The sample is a PDF containing a large number of external links, many of which point to potentially malicious or SEO-farmed content. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to learning English, likely to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=ksi%25C4%2585%25C5%25BCka+angielski+dla+pocz%25C4%2585tkuj%25C4%2585cych+pdf
    • http://files.interporcspain.org/uploads/1/3/1/0/131070774/sibeterononela-xogozijedukul.pdf
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdf
    • http://files.curvaceousglamfashion.com/uploads/1/3/2/6/132681969/mefiboxugoguse_semaxutudaka_zolizijiwisog.pdf
    • http://files.kreativebykrista.com/uploads/1/3/1/6/131606367/konaw_tufadixotip_didosaw_mujopozokomiza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/64946991070.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/73832775552.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/vizumasezunejobenunolox.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/duzowex.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/156506455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/rubeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/xopogido.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/95596815966.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/32492600856.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/38023659636.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/22247249268.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_off0000709c.bin
0269ba4a3e66de412c2c7f37e9f9d1a2bf115f170ade6b50aa9090b309ad4e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709C 5800 bytes
font_01_sfnt_off000083bd.bin
28366a7e4b8182a883011868c48af73ad5e5243a8ffeb949b3a2f45b11c4b441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BD 11948 bytes

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