Malicious PDF — malware analysis report

Static analysis result for SHA-256 034ca9fd8d61acc3…

MALICIOUS

PDF

41.2 KB Created: 2020-08-05 23:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2841c23003d9019188e6744a1c45a0 SHA-1: 6013f1e908d9af93b8cb513142ebc744f893fd64 SHA-256: 034ca9fd8d61acc362d8bce30a2dc6c0e3fbaddc136feb8c011532b392eb11c0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.com/pify?keyword=letter+writing+format+in+english+formal+and+informal+pdf', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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.com/pify?keyword=letter+writing+format+in+english+formal+and+informal+pdf
    • http://files.allsortspreschool.com/uploads/1/3/1/6/131637498/1799845.pdf
    • http://xiziki.cs.ogdcl-nthp.com/uploads/1/3/1/3/131398091/kamagiveke_golukazakiwazom_lasewaxitipe.pdf
    • http://files.atlanticcirqueagency.com/uploads/1/3/1/8/131871692/212501286c259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/granblue_unite_and_fight.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/nationalism_theory_ideology_history.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9915/files/tire_size_conversion_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54341666742.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/ladizimudelaxugudot.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/wefazumiwonesox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/71211125732.pdf
    • https://cdn.shopify.com/s/files/1/0428/3724/6118/files/rajukitasufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/kedakexewamejavujujev.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/nolepofidefijajatokopen.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/92101915578.pdf
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/telecharger_alter_ego_b1_gratuit.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_off000062c4.bin
816f10757c5eeb811574b7109ba1cdbc0ec389022abed50a577dada7630f54a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 5488 bytes
font_01_sfnt_off0000755c.bin
0c4232e63b7b2c070bb816c1e7a9905f0ac59bb2367c34311143711673eeb048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755C 10060 bytes

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