Malicious PDF — malware analysis report

Static analysis result for SHA-256 586452ce447a925c…

MALICIOUS

PDF

38.4 KB Created: 2020-11-07 00:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6002e2d349483d2a968ba37eef1b6ce9 SHA-1: 9d18db05e6d8dc20a28f94ded430d191ecd10faf SHA-256: 586452ce447a925c73e50ed1234c2d7c27f4e6a84a88087c64b1a84d9e9633ff
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?keyword=2003+ttr+90+service+manual+pdf In PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/8540069.pdfIn PDF document text
    • https://nulunofelixor.weebly.com/uploads/1/3/4/6/134646046/5260853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fa1430d85e0a.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/gedosimosivujojad.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/08727b9c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f9a6d94509b9.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/86e0b16c69fc3.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/paxivogedewilu/70615785666.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/xemuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63077ce3-8b9f-4ade-a7d4-775d7a7615ee/mizopobudadikogolofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413f7850-0fb0-43a8-a549-ab447e475ff9/siwiwitozin.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/opioids_epidemic_cdc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6202d9ac-92f2-40e7-a23e-dda0a42b6ced/38057350782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3489fc6-d021-4ca2-9784-a29fe51b3e89/the_artist_s_way_julia_cameron.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_off00005781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5781 5860 bytes
SHA-256: e6e10b9d5681822359db3cbe513f488bb832a576642347478b45178f05581aab
font_01_sfnt_off00006b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 9732 bytes
SHA-256: fd1e4f54f83c691b238d201278312cb69555733d7d750b54bd9f32997b2fe60a

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