Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d429ac2e25610a…

MALICIOUS

PDF

39.7 KB Created: 2020-10-27 16:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cb7d9f49cd4221b1b163a89b511a614e SHA-1: d70189a93c6a41614ba2d6dd3f97658fcf896411 SHA-256: 36d429ac2e25610a90a5815360ad103d13a5ce93014ef967a36178a6e3e8cf6e
154 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 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.
  • 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://ggtraff.ru/strik?keyword=descargar+libro+de+sapos+a+principes+pdf+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5f979446ce6ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5f8b774c2e8b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8a502a82b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f8d4a372e7fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f8c813c75e51.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/1c898495-ff51-4d8c-ad00-1366f501f645/83408309521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d175cc-e1c8-47d5-9518-901f8aaa1142/valelaxojezunun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d5abb1-10ff-41a2-94ca-00087f74b86e/que_es_el_mecanismo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b64454-f261-4f3b-9238-fa147ecde97f/36367756326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af437289-5bdd-448a-a0cf-9a0f1fa91e37/37508667923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7f9abe-0f98-4f00-9fe8-caa4e56f25b8/how_to_find_slant_asymptotes_synthetic_division.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/61411102587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9734/9023/files/casio_lk_100_specifications.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5458/7295/files/67329942638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2580/7540/files/xivikaxexuwelafusup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6739/9076/files/fx_explorer_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/merit_badge_answers_citizenship_in_the_world.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4258/4760/files/uc_mini_old_version_apk4fun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/ruzofegulapezefijerab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d15bb1-5461-4f7d-ab36-843d8ba18072/kapovutitafipubipegetupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb2665e-35b2-4a8a-9aa6-6f3fccf87db6/10859467072.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C9 3160 bytes
SHA-256: 00b6f289508b7b57d8c8807e522342179b757a0d8458e7a33b34f60409ab9ea9
font_01_sfnt_off00005c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0B 5464 bytes
SHA-256: 19dd2e4fc06578442caa2007df06fd8d0211f98fc792447ee23d7b587c6a31b1
font_02_sfnt_off00006e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9E 10492 bytes
SHA-256: 587deb6650e933987b86f056c39db960253a769b2d999ce98f6e6221f584faa2

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