Malicious PDF — malware analysis report

Static analysis result for SHA-256 73809ef32538bd7b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-09 08:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cdd3076888137a70743a80a5187f84da SHA-1: e03a97128e1158b674052e0900ffd8cff7dfad95 SHA-256: 73809ef32538bd7b04281d98f6156f5c520e4664108b09f11d1689d71d55726d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a redirector URL, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link indicate an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=apicultura+costa+rica+pdf In PDF document text
    • http://files.deemaciephotography.co.uk/uploads/1/3/1/8/131872055/9255341.pdfIn PDF document text
    • http://gitizota.bellabirth.org/uploads/1/3/1/4/131438477/wofukijav.pdfIn PDF document text
    • http://files.reversac-traductions.com/uploads/1/3/1/4/131437044/2785849.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/1/0435/9254/8511/files/65178783129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/mixed_present_tenses_exercises_with_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/17799114240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/71334624635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/19389742857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/23949759076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/rabuzonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/karixowatevejilepipamad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6755/5481/files/26510115412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/vakuwaromubil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/faronojomaruvoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/pizoximazerixu.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
🗂 Part of campaign: reversac-traductions.com 3 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000703d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703D 5140 bytes
SHA-256: 92765c72519770914f0b4fb112b6f72e05ff00df89c9cd15428b460dafeca512
font_01_sfnt_off000081c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 10428 bytes
SHA-256: 72c88535429eae92152077e86ef1f701d9e092c687836c141c0356bf21996300