Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3468c617eae3cb2…

MALICIOUS

PDF

32.2 KB Created: 2020-09-04 17:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 98bb6255756b3e03f4d67fa41a99e205 SHA-1: 2996c57dc6fd70eedd4896bb9662ebf141a4b241 SHA-256: b3468c617eae3cb2420a16803034156ad02c9885fa489fa895109fc72ed279d2
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as an academic worksheet. This suggests a phishing or SEO poisoning attack, aiming to drive traffic to malicious infrastructure. 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.cc/wix?keyword=intermolecular+forces+practice+worksheet+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/rekagirawukelasusibidon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/35735791337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/3310/9156/files/crisis_assessment_intervention_and_p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/14264669491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/area_of_regular_polygon_problems_and_answers.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b97dd_3282d031231d46979b140e69c775bb1d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/69a512_de706bd4b59e498593682b6164481417.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70094d_4839eea04e2246e090ab903b68ece18f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c75f60_a8574324181a4ab093c5267e986098e8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f35da0_0a3ff7873212442599031c9b160afb14.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c4177_e164bf378cf14f1fb39b337eff3ce75d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d954c5_b16b3e95f6ee423c9ec8a19a08f5efb3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f7fbc8_114292555cf04d738ae571d3bf9554cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1c90dc_5824f4e896a34daf8a36e882fcc02db9.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A6 5348 bytes
SHA-256: 3bc107b6c0bfd33739173f778aa879e3a4c7f600e04a5fdbb84765a4b70c2ee9
font_01_sfnt_off000055be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55BE 8800 bytes
SHA-256: 20c4d4986eb316a7bdfc125fdf8f71ab3e50752c69ac52713c43de1b6c9cf078

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