Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3112f647a7b6792…

MALICIOUS

PDF

169.8 KB Created: 2020-11-06 06:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 526bac2ab071bf896e0db43b3d230ba2 SHA-1: d3568007e125847a92f118b87d4d772f5b292c01 SHA-256: c3112f647a7b67924bb565f6f2f9ff7467b44393297096a6d12dcf971d1db568
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of a malicious URL indicates an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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://traffmen.ru/strik?keyword=kanna+5th+job+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5f8ffcad4b62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5f94757ebedb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5fa0652b449da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_5f96ef6ba5408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f928ca95b9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f97806f06787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_5f9ee2eb3c930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8fd86f71847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/push_vs_pull_strategy_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/84012766237.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/precalculus_and_discrete_mathematics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/zedax.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/manual_for_instant_pot.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/annies_plaid_shirt_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/mifimebibelekeninifi.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_off0002637a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2637A 5088 bytes
SHA-256: 2695977f26007dc757e8d3833a32555e638f5ca40c34b4b28dc0fd1fd81ca925
font_01_sfnt_off000274d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x274D7 10808 bytes
SHA-256: c220738a444889adde9a120233c46677a42375f8edd6497ed0780f036d4a0e03