Malicious PDF — malware analysis report

Static analysis result for SHA-256 3844cffdfd83c98e…

MALICIOUS

PDF

45.4 KB Created: 2020-10-28 00:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 356db8a859237b7c7b2baa0b01959737 SHA-1: 74e7353f94a7ddc9026671e5bb13f4e107f319b1 SHA-256: 3844cffdfd83c98edf1318326c272f6dd29bdb80bc35a244845e94f4b824df25
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure the user to a malicious site. No scripts were extracted, but the presence of numerous links indicates a link farm or phishing attempt.

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://ttraff.link/pify?keyword=por+15+top+coat+colors In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5f9769369e2a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f8e34b17eb10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f939284ec525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8bf21aba062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8d167060973.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/kavajuzo-jijiwoza-datawuboso-kizeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/56540788635.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/25155598063.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/muwogib.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/94666454250.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/baby_names_in_tamil_for_girl.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/91217681465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2363/3053/files/wiimms_iso_tool_ubuntu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2735/6577/files/vosadofabof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5321/9479/files/ansys_workbench_mechanical_users_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8462/0978/files/80692008123.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8981/4187/files/fatepujofelixoru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3491/0103/files/fofowemufilelebulotufuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1739/0245/files/pokemon_xd_gale_of_darkness_randomizer_rom_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/wasekasanaremizetik.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_off000072a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A1 5104 bytes
SHA-256: 1c10cf1d06fd71f4fcaef331456cabfdf711d38961fabb3c323bb521a9cc9525
font_01_sfnt_off0000840c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840C 10828 bytes
SHA-256: 30acb24b3160699076fdf9916e53d7d2243c61665f4b5af12fa4a2358d4029de

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