Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ac4f765a12d597…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fc955a55663d4560ddafb1053f03a90a SHA-1: ef6e9bfa9b6e6e611df2c2e262fdd952fa105095 SHA-256: 18ac4f765a12d597e6ad0c70c75616e5a131b55699353c076d74ada928a14eee
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service identified as malicious. The document body, though corrupted, suggests a lure for free templates, which is consistent with the SEO link farm heuristic. The ML classifier strongly indicates maliciousness, and the embedded URLs are the primary indicators of compromise.

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.ru/pify?keyword=children%2527+s+birthday+invitations+templates+for+free In PDF document text
    • http://files.trifexy.com/uploads/1/3/1/4/131437276/zuzuzise.pdfIn PDF document text
    • http://files.bigcreekbulldogs.com/uploads/1/3/0/7/130775431/vexepivujesu.pdfIn PDF document text
    • http://ziwuviwat.thenchtuk.org/uploads/1/3/0/7/130776445/3529956.pdfIn PDF document text
    • http://jizuvage.holmescreekbc.com/uploads/1/3/0/8/130813821/2d45fff24.pdfIn PDF document text
    • http://kizori.wrightonlakemeredith.com/uploads/1/3/1/6/131606598/6838a.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/1/0430/1514/3587/files/mebevoruvape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/cloud_reader_kindle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/volinuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/94087249311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/54068397777.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3258/4087/files/55515564119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/sepixebifoxabixefepebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/tesip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/subject_verb_agreement_ks2_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2982/2631/files/html_progress_bar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8688/8612/files/bikos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/resume_cover_letter_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/76979435521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7698/0629/files/jesebupisavelagigijata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1342/9655/files/cedula_rfc.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_off00005b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8F 5524 bytes
SHA-256: 81f19572b0dafe50685dfadbeeb3ef918256dc8b9a3fdda0bbc3c307fde4c7ba
font_01_sfnt_off00006e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E28 13096 bytes
SHA-256: 139a9f6183b2a9e105f9575fc553ad1298e53cdce232d03cb4738573b379bb38