Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c667d2a77e1e29…

MALICIOUS

PDF

45.9 KB Created: 2020-08-12 20:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 777ff74e6fefb3083234ae50cce433c7 SHA-1: cb323dc3a87c7aff6a8a72963e83b8f1a3a82edb SHA-256: 18c667d2a77e1e291f39d5d8ce483d1c320dc854bf5124be10c56ecb7a1cac6d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and SEO link farms, indicating a malicious intent to drive traffic to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded links suggest an attempt to exploit user interaction, likely for phishing or malware delivery, aligning with spearphishing attachment tactics.

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=autocad+pdf+export+blank In PDF document text
    • http://karabax.msreevessaltus.com/uploads/1/3/1/4/131453247/300f5226e4a.pdfIn PDF document text
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdfIn PDF document text
    • http://files.jessiesfitclub.com/uploads/1/3/2/7/132741556/wamezo_segana.pdfIn PDF document text
    • http://files.robertnoonanartanddesign.com/uploads/1/3/1/3/131380120/7802518.pdfIn PDF document text
    • http://nagej.leighkotsilidisart.com/uploads/1/3/2/6/132681352/juromalemesifa.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/1/0434/5180/9957/files/idontwannabeyouanymore_chords_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/69386165547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/zombie_bass_tab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/37514490626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/83454648652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xasaxikopakepiditewevumub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2158/8888/files/1801361500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/widoxenemisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/72886022931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/retained_placenta_treatment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/confluence_vs_jira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/17983560049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/string_theory_equations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/rusuwatafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/zadupixoliko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 3936 bytes
SHA-256: d3a16f6e117b2104972e41d94ef73e8fd236dd190ccfc2eb27eb43a52b1bb6dc
font_01_sfnt_off0000745b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745B 5232 bytes
SHA-256: b849982cf3dc775b9352d73c6e80ca8f725291e6ba87ef656209645b48c391c1
font_02_sfnt_off00008634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8634 10512 bytes
SHA-256: b0e6da800aaa810f3b01ee11853531726164bbc4af6f4d541b98aa807cde0d7d