Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f44b3721dbc6f2…

MALICIOUS

PDF

43.4 KB Created: 2020-10-13 13:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9f536606e121e38353b36d2f18c73492 SHA-1: 2be9218fe968de887ada39f6393a2c119af0afbe SHA-256: 41f44b3721dbc6f2f4a9787c16b25b47cf9a6037db0dbe338456eeeb26f0398e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links pointing to external PDF documents hosted on various disposable domains. One of the links, https://gettraff.ru/strik?keyword=logiciel+gestion+de+stock+gratuit+simple+android, is identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to manipulate search engine results or distribute further malicious content, with a high ML confidence score.

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.
  • 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://gettraff.ru/strik?keyword=logiciel+gestion+de+stock+gratuit+simple+android In PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wozumadaku-mukevewurovebu-nefebo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/79958851217.pdfIn PDF document text
    • https://site-1037914.mozfiles.com/files/1037914/gewarupalilebiwaribibi.pdfIn PDF document text
    • https://site-1038548.mozfiles.com/files/1038548/timurilamed.pdfIn PDF document text
    • https://site-1043848.mozfiles.com/files/1043848/96422187035.pdfIn PDF document text
    • https://site-1040670.mozfiles.com/files/1040670/11453979152.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/1/0497/4244/6741/files/hewlett_packard_6500_printer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/sola_busca_tarot_meanings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4111/9647/files/68180328473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4110/7353/files/71563856816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9572/9348/files/the_algebra_of_happiness.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_off000067be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BE 5400 bytes
SHA-256: 9a0d9f81b507fd3b34104f644af7db3deb60ffc70bef936cca80b506e3ce7193
font_01_sfnt_off00007a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A07 11384 bytes
SHA-256: a69e94f01c5ca79957aab846828c55f43a5e9e1496cdfc049a21a0c4596a9510

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