Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad28aa60a15f96b…

MALICIOUS

PDF

38.6 KB Created: 2020-10-04 04:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd28e1166228b3acf692f4e61ec2ed21 SHA-1: 2a620014e9e06008c7352dbe05cab7b1ff11f781 SHA-256: 7ad28aa60a15f96b350cbf2b45ab588938ef9fadc0eff1c8354a808c2f627b1d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm or spam campaign. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=wh+question+exercise+pdf
    • http://vodafili.garywelton.com/uploads/1/3/0/7/130739540/7490370.pdf
    • http://lodoleke.cassinsackett.com/uploads/1/3/0/7/130776826/daguzofinikawesad.pdf
    • http://files.highaltitudefirearms.com/uploads/1/3/0/8/130814283/63957.pdf
    • http://files.moccwfirearmstraining.com/uploads/1/3/0/7/130739996/7010718.pdf
    • http://pitajof.rangewaysupply.com/uploads/1/3/1/6/131637649/962ca9a0a63e775.pdf
    • http://files.gracekutztown.org/uploads/1/3/1/0/131070231/1422585.pdf
    • http://files.pmiterms.com/uploads/1/3/0/7/130738822/bd2fc19c8d193c7.pdf
    • http://tawimisal.fleischerstudios.com/uploads/1/3/1/8/131872303/9706982.pdf
    • http://nepap.jaimejphotography.com/uploads/1/3/2/6/132695615/2d4707d5194.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/jijavelopilawude.pdf
    • https://cdn.shopify.com/s/files/1/0477/5519/8620/files/show_ip_protocols_passive_interface.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/nesitosijidu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/82495570636.pdf
    • https://cdn.shopify.com/s/files/1/0483/8732/6110/files/22820417709.pdf
    • https://cdn.shopify.com/s/files/1/0480/8920/2851/files/launch_trampoline_park_norwood_ma.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_off000058ff.bin
d906dfb5a36a9a94c877148abb7d75812850f8dc7ac04fbd2fd392b88248d47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FF 5208 bytes
font_01_sfnt_off00006ac9.bin
8d99d2a6b71cf62df9748a1b5918ce93de5e1dbf5fe167dacc96d89eb7209228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC9 10348 bytes

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