Malicious PDF — malware analysis report

Static analysis result for SHA-256 686634535ff3410f…

MALICIOUS

PDF

68.0 KB Created: 2020-11-02 21:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4d9cf5ca0b49dacabfc5495a4502064a SHA-1: 29dbda477acfc4d7eb01481cfc51e45eef1d6149 SHA-256: 686634535ff3410fdbd13029beb54540fb14a42b2ca10b8decc8a7d21da91c2e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document's structure and content indicate it's designed to lure users into clicking these links, likely leading to further malicious content or phishing attempts. The ML classifier strongly supports the malicious nature of this PDF.

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/123?keyword=miyuki+nakajima+wiki In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f95830d3de3b.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/f86860f5e3070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f9a12b4e02f7.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/gagen.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/5516544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f9e56cfef644.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/tanixoson.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/969a8ab90.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/vibove/simple_harmonic_motion_pendulum_lab_report_discussion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/brute_force_wifi_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9079/5426/files/total_war_3_kingdoms_unit_guide.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_off000091ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FF 18096 bytes
SHA-256: 00b3221ae3123d2c64bdc83536c882ba43b91a22077b403511b03ca142c2e2f2
font_01_sfnt_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 4864 bytes
SHA-256: a3d9a8c9c39a8a5b1beb65242cc44c5087604b127f5309925c188882aa9b84ec
font_02_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 11564 bytes
SHA-256: 7b042e7147cade8a402b3c91d067f9361fe645b88de6d0dbc164942fab1e8158

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