Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9535f21fe55a214…

MALICIOUS

PDF

43.5 KB Created: 2020-08-10 03:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1618ce7ddcb49d208b0ce07221fa6eb0 SHA-1: dd5ade1441ce974d2e327f216daf3d68aa3d4dda SHA-256: a9535f21fe55a2147c3f848c001d62bcc00bab3fa5d0ce476ab39e96a1358983
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'nomenclature of organic compounds' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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=nomenclature+of+organic+compounds+with+functional+groups+pdf
    • http://files.broadbandaccess.org/uploads/1/3/2/6/132682204/c6269dcea.pdf
    • http://files.theuniversalgospel.com/uploads/1/3/1/4/131407980/c80e695.pdf
    • http://files.kimklassybling.com/uploads/1/3/1/8/131857049/fab58f1841b9.pdf
    • http://files.stonesthrowtravel.com/uploads/1/3/0/8/130813526/segoroxolanevef.pdf
    • http://tagavo.aplusacademic.net/uploads/1/3/1/4/131408970/8420597.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/nesutipidumapebefifot.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/types_of_occupational_health_hazards.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/79575716306.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/95201792443.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vowalege.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9080/files/fidadozeropuwokoduketux.pdf
    • https://cdn.shopify.com/s/files/1/0428/6152/7206/files/journal_articles_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/74894355718.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/understanding_business_law_curtin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/criminal_law_book_1_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/athlean_x_abs_workout.pdf
    • https://cdn.shopify.com/s/files/1/0436/1184/8861/files/hernia_inguinalis_lateralis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/5024806858.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/55245716780.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c29.bin
7f5110e02df06b37f0aa871f4b474b34403afeb1d28ce25a14b90d8103069e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 5632 bytes
font_01_sfnt_off00007f3e.bin
6fa540343243a247e992008f33eeffcb79c9d098d335f7d4320c06262c0574cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3E 9664 bytes

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