Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f128c12ae2cf82e…

MALICIOUS

PDF

55.5 KB Created: 2020-11-01 07:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 20771e987116085971b6b19c7cb40269 SHA-1: db438fed3dc071c26577e43ec47398f419b124d7 SHA-256: 5f128c12ae2cf82e68aa977e0554de5f87eb7f287e42445300978e18602f2462
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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.link/123?keyword=quien+es+la+hermana+de+celia+cruz In PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/5cce1deb93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8758ae64871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f88284718dea.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/ximanazopenivunepuma.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/94b984da07c.pdfIn PDF document text
    • https://saxejuwujare.weebly.com/uploads/1/3/4/4/134448786/2247697d191f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10088c10-f92b-4f02-ad12-a49bc0c6a697/71037664938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0747/4844/files/zelamoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d521a20-fce0-4e23-a3df-a6dfab197d17/9548767017.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/restaurant_business_plan_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374afc89-9327-4350-a4a2-a1c09df17384/98239223070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3078/8268/files/warren_buffett_investing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8197/1908/files/wofagaban.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 5268 bytes
SHA-256: 108cedb732530ebbb7c62df9d8cad348958e7dddfe15986d097258b920247426
font_01_sfnt_off00007abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 5288 bytes
SHA-256: a9de648ccf9a932ac4f485e246fdd7a8bbeb221deb5c1dce292c119a4c6d42da
font_02_sfnt_off00008c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C92 13144 bytes
SHA-256: dbf2f3c4462290e29ac4b8daa9a11b6657c550106e4fe8691feccb3da06c17af
font_03_sfnt_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 16572 bytes
SHA-256: 374f24ec86927448cc604b794ff092d3f0ed77a306f5e96e8a0b92e490d381d9

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