Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a96652b34ea111…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 04:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e968f34c8c59e43b7896289ef222347 SHA-1: a832f9093f4a6f936262f8c5debe1a46b1cc6ce2 SHA-256: 09a96652b34ea1111f8bf28f8473759b0d431b9e7a08159d42cf4771f28b3ac2
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the document as malicious. The presence of numerous links suggests an attempt to leverage SEO poisoning or to distribute malicious content through a link farm, likely as part of a phishing campaign.

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=endometritis+cronica+inespecifica+pdf
    • http://files.woeschwiiber.com/uploads/1/3/0/7/130739918/689356.pdf
    • http://siwitiged.banglauniversalsociety.com/uploads/1/3/1/8/131857631/5079192.pdf
    • http://files.absolutelyfabulousfashion.com/uploads/1/3/1/4/131438464/kivedo-vugalaxa-sazuvorafij-boguwa.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • http://files.packofmoosepetservices.com/uploads/1/3/0/7/130738803/girog_rigibomagoluji_mikimi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9167/2736/files/62200986425.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/pewas.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/58525746591.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/51653075714.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/wanumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/51384552231.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/dugitofizugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/6524662356.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/mo_creatures_mod_1_8.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0853/files/61098379635.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/44396683198.pdf
    • https://cdn.shopify.com/s/files/1/0435/1767/3636/files/kusaloge.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/59994546335.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_off0000682f.bin
2ad21f0c6a1832ff8617137e92165aded4d41167716e7717c9f682db0a002953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682F 5228 bytes
font_01_sfnt_off000079df.bin
f59132d786c92f5a94c70c83e8f140c294f6ed9a6b47bc4fbe691aef80dfc66d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DF 10968 bytes

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