Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd71d25779796b0…

MALICIOUS

PDF

40.7 KB Created: 2020-08-24 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 298c5916aaeee6d51e8ac8dc88f2359c SHA-1: 2b165df2908dff209bd665d91030adefe74f4a23 SHA-256: cbd71d25779796b085f06872568b305cd3098aae744d96f4b0f519931a1e52f2
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to potentially harmful content. The document body, though heavily obfuscated, contains a URL that aligns with the identified redirector. The presence of embedded links and a 'download' lure strongly suggests a phishing or malware distribution attempt.

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.
  • 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.
  • 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://ttraff.ru/pify?keyword=frontline+commando+ww2+mod+apk+latest In PDF document text
    • http://files.jorieberman.com/uploads/1/3/1/8/131872149/6136816.pdfIn PDF document text
    • http://files.trlegacypartnership.org/uploads/1/3/1/3/131383727/nenakusedarefitim.pdfIn PDF document text
    • http://files.kantishnaouterwear.com/uploads/1/3/1/6/131637419/6963786.pdfIn PDF document text
    • http://files.youruniverseyoga.co.uk/uploads/1/3/0/7/130738751/vitogolav_wonuvosanelif_mupufadasemib_laridiz.pdfIn PDF document text
    • http://files.catherinetrinkle.net/uploads/1/3/0/8/130874125/608214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/photo_editor_blur_background_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/bumoxudozevixodimururisax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/87721537220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6056/0025/files/62093667570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/66843999565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/aliens_colonial_marines_technical_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/fairfields_primary_school_cheshunt_ofsted_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/men_at_work_overkill_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4002/8325/files/nedevebusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/free_able_abstract_art_prints.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/96776462956.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_off00005d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D71 5460 bytes
SHA-256: bbd28627b67d823540452d41ff8777ce3367ddfec6442ab6e5bf4536e5fd3e17
font_01_sfnt_off00007000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7000 11020 bytes
SHA-256: 4c1ed054b9522bd3f5a9b373fbb9b85a80dbe803cf3d002309a9d15340eb44ee