Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a895f3270cfdfaa…

MALICIOUS

PDF

47.2 KB Created: 2020-08-14 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a3a2cb0560a743856c06dec1023ceee SHA-1: fe48b082f9811dc0dffec69d6471f5eef7aa17a1 SHA-256: 0a895f3270cfdfaac285161566ae8768c4b429f92803523e3f1f139c505a5ac1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a deceptive title and body text related to a cell comparison answer key, but its primary function is to host a large number of external links, many of which point to other PDFs. One of these links, 'https://ttraff.ru/pify?keyword=prokaryotic+and+eukaryotic+cell+comparison+answer+key', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=prokaryotic+and+eukaryotic+cell+comparison+answer+key
    • http://pemolop.nxbphotography.com/uploads/1/3/1/3/131381787/3aa82.pdf
    • http://files.littlerabbitryontheprairie.com/uploads/1/3/1/3/131379295/29d1a4f9.pdf
    • http://files.fcninternational.org/uploads/1/3/1/6/131637240/3847481.pdf
    • http://files.greenremediesnj.net/uploads/1/3/0/7/130776239/sujejukiroxiwilaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/32688314216.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4178/files/48927005178.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2233/files/mdu_4031_uf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/vexuvevajibuxurevaziri.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4691/files/63058616619.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/32770118232.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/botw_windblight_ganon.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/podafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/dijubiwalubizaku.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/61803162022.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/77553828961.pdf
    • https://cdn.shopify.com/s/files/1/0434/4070/1606/files/sirobedazose.pdf
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/jinebozelibawujimibuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/36066222766.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_off000072f9.bin
51e5eae74a956b863fdc939b8336747b3f90c0142be840e4eeaff87cb8719698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F9 5476 bytes
font_01_sfnt_off00008595.bin
1504488bdd790e6c23373e469979121dd7948b314850302682b8618ef6184953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 13160 bytes

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