Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3162aa6875185b4…

MALICIOUS

PDF

37.1 KB Created: 2020-10-04 00:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: faa40d2eb086633a0223bb6a664a2135 SHA-1: b4be84487094227b7e57f97524d702e03a59089b SHA-256: b3162aa6875185b498cbf5fde60b9ba1c968f005311d396f67f09eeaa95c19ff
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://cctraff.ru/strik?keyword=the+intelligent+investor+book+pdf+download+free'. The document body also contains this URL, suggesting an attempt to lure users into clicking it under the guise of a book download. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=the+intelligent+investor+book+pdf+download+free In PDF document text
    • http://files.driftawaystudio.com/uploads/1/3/1/4/131483383/8914799.pdfIn PDF document text
    • http://rifanizu.jenniferihm.com/uploads/1/3/0/7/130738524/625598.pdfIn PDF document text
    • http://pabitew.oaklandtep.org/uploads/1/3/1/8/131856257/f2ff2.pdfIn PDF document text
    • http://files.rebeccajaynephotography.com/uploads/1/3/1/3/131398308/a47d32f.pdfIn PDF document text
    • https://site-1038909.mozfiles.com/files/1038909/61762796620.pdfIn PDF document text
    • https://site-1039730.mozfiles.com/files/1039730/xovupawevaxakufav.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/jexatimibasonelubonif.pdfIn 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/1/0441/1287/1576/files/goodman_rock_mechanics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/happy_tree_friends_petunia_and_giggles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9515/4069/files/sims_4_male_pregnancy_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/d-bal_vs_dianabol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1811/2154/files/great_white_brotherhood_sirius.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1556/9060/files/lazy_boy_small_recliner_covers.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_off0000522c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x522C 5608 bytes
SHA-256: 6829bf93e12e2c97341dac7fda974ca81091b18c9effa7c8d4b90b1425dd2711
font_01_sfnt_off0000654e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654E 10076 bytes
SHA-256: 3613b18b16e0754147096469fb2f77e89eea2daadd3c53af98857829e6536c90

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