Malicious PDF — malware analysis report

Static analysis result for SHA-256 1508ae11907d5c03…

MALICIOUS

PDF

41.5 KB Created: 2020-11-08 11:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba57b0297137cc3f47c4058925adf36 SHA-1: 135823ce99b88cbb026a8bae8adddd79129dd1f4 SHA-256: 1508ae11907d5c03d18350c89a235f7c4484a6ac39c880c2d1d67567c921e71a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs, including suspicious ones like 'traffnew.ru', points towards an attempt to redirect users to potentially malicious content or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=aps+march+meeting+2020+denver
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vudodapazepipux_kijemomebegax_velagokotukif.pdf
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fa7063316cf9.pdf
    • https://sufewusog.weebly.com/uploads/1/3/4/6/134644796/fadutidipotuv_waxenasogev_xofezilo.pdf
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/6020736.pdf
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/5069808.pdf
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/wukevono-bapegonexejukal-mewutezizepelo.pdf
    • https://muvoletad.weebly.com/uploads/1/3/4/6/134642496/fosigowaf-giguvadopijasid-ronarososidega.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisazabe/29432785987.pdf
    • https://s3.amazonaws.com/sugaguxagu/chase_freedom_unlimited_visa_signature_benefits.pdf
    • https://s3.amazonaws.com/xezujuxoz/neumonia_tratamiento_pediatria.pdf
    • https://s3.amazonaws.com/welanisowari/rudin_analysis_solution.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_off000060fe.bin
f7e8da607445201a4ab2c4f05633309534812f5b33f763600d1a19e19cd0735f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FE 5780 bytes
font_01_sfnt_off00007479.bin
1b68561ea314280052c56d06e1eb3d0d03dfa346ed83e5a8da30baa95b807eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 10564 bytes

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