Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3138b4b14dc171…

MALICIOUS

PDF

53.9 KB Created: 2020-10-31 06:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a695aaa59bc1e2ffeacb5b1b848c6f24 SHA-1: f7b06a24106b9eb74906b0b84eb67adfe626b9b9 SHA-256: af3138b4b14dc17137ebec2341d0fc3a1a5d4b80f39d4560665aa854845df287
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.me/123?keyword=sony+str-dn840+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5f8a9daa46d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8e2232941a0.pdfIn PDF document text
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/59f79b9e1c.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/fasanag/43476887838.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/mentor_calibre_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/haematoxylum_brasiletto.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/american_idiot_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/beetle_larvae_identification_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4605/8149/files/toy_story_racer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/research_paper_example_apa.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_off00009279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9279 5632 bytes
SHA-256: a4660bf5abc72695c12a5e12e733e5d2ad0a54574cce68e368a927ca92695572
font_01_sfnt_off0000a59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA59D 11092 bytes
SHA-256: 118ec00b8ebb0a5af0243c230011803561c615ef174dc2fb8a43c86d896053cb