Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb9a733d728e440…

MALICIOUS

PDF

41.8 KB Created: 2020-10-06 13:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4d0f1689481bf9e27eda6e8db14e4aab SHA-1: f490c63b0dae5e8978ae1cb05a58690508c1a82b SHA-256: 7cb9a733d728e4406198256b40524934d0caf9e27a1b4367509d15190aa57e2b
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list, reinforcing the malicious intent of redirecting users to potentially harmful sites.

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://cctraff.ru/strik?keyword=cordless+drill+storage+charging+stat In PDF document text
    • http://files.emilymajors.com/uploads/1/3/1/3/131384142/27ab879d8f907.pdfIn PDF document text
    • http://kosopo.loudlibertarian.com/uploads/1/3/0/8/130874222/vixujosabakiz.pdfIn PDF document text
    • http://files.6224marketing.com/uploads/1/3/0/7/130739537/0aec5ee.pdfIn PDF document text
    • http://files.jordandeadseaminerals.com/uploads/1/3/0/9/130969231/815595.pdfIn PDF document text
    • http://files.fromchristaskitchen.com/uploads/1/3/1/6/131636881/wivonobagola_gimopaxoz.pdfIn PDF document text
    • http://files.modelrailways.tv/uploads/1/3/0/8/130813777/resizabes.pdfIn PDF document text
    • http://files.mobilityfamily.com/uploads/1/3/0/7/130738621/gixosowazodetis-wutusevinagi-lisexig-gexowinopudadu.pdfIn PDF document text
    • http://files.chrisbirdsnthings.com/uploads/1/3/2/6/132682030/xinijefibopisafe.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/705f4c9a-6851-43ab-9040-217c19be28c7/sexaliwumelujitilufalixex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/43882982255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6280/6678/files/3844983795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3095/4655/files/philips_portable_dvd_player_dual_screen_manual.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_off000065f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 5104 bytes
SHA-256: 92856daafe8beba65e9282b2a6fec9ae361e89cc03aa4a493957b36c3948ce23
font_01_sfnt_off00007740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 10344 bytes
SHA-256: 801850ceec96826f05ca05ec75c634df65d4d1468692167331a83003ebdf974c

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