Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b8c504ad4f6ab9…

MALICIOUS

PDF

48.2 KB Created: 2020-10-03 19:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b5492e5d0cd1084c512653e034c95a1 SHA-1: 3c550ab0b339fa5d16be0d3e1e40efc7fa495985 SHA-256: d1b8c504ad4f6ab975a55320504ea3d2787bd22f43f0773bc6eb5a16c671b51e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure designed to obscure the final malicious destination. The document body and embedded links suggest a lure related to product manuals, likely to trick users into clicking through to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of known malicious redirectors.

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/pify?keyword=lg+inverter+direct+drive+true+balance+top+load+washer+manual In PDF document text
    • http://files.serenielle.com/uploads/1/3/1/8/131856567/b894c0ac75c.pdfIn PDF document text
    • http://xezodit.awallacemarketing.com/uploads/1/3/1/3/131398493/4630003.pdfIn PDF document text
    • http://xafazew.bestheatingandairia.com/uploads/1/3/1/6/131637881/zigaveroru_furej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/30441889750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9010/6775/files/87337847309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0285/0203/files/vibugunuxuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/zekedetosujusivuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2759/7981/files/56777110253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9270/0062/files/recombinant_dna_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/4631/8492/files/tricare_for_life_prior_auth_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/wemeril.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0581/6227/files/osrs_runecrafting_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04bae0fd-f3c2-45d2-b391-f7ad6099ebf2/vanotozigiforidijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdbc5f7-0ad0-435f-913c-ad705a09c1e2/79129992967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a340bd-de63-4fd7-907e-83247be616e8/55981874280.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_off00006f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 5604 bytes
SHA-256: e01ec995a8b7c3ef30807598d6dd2e43d687930f7b1652c090e950f6e9c565a5
font_01_sfnt_off000081f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F3 10168 bytes
SHA-256: b8a14ff03bf015569745b897e1e7f5cf03ddb2bda682decfc7a161610a3be1a9
font_02_sfnt_off0000a4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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