Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7157139657283b3…

MALICIOUS

PDF

53.7 KB Created: 2020-08-15 01:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7acaee005b2935960a80515d36f638be SHA-1: bd76eb4a71f05eefd87de3865a013348b3066799 SHA-256: b7157139657283b38ae22a62e6c6de812df193ed9cf1ed25f9581716c0c0c540
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for a 'house buying offer letter template'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm for SEO-based phishing.

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.cc/pify?keyword=house+buying+offer+letter+template In PDF document text
    • http://gumat.hunterhomeinspection.com/uploads/1/3/1/8/131871390/8790626.pdfIn PDF document text
    • http://files.robertstanhope.com/uploads/1/3/2/6/132682882/bedasizefasajej_nukirixav_gipud.pdfIn PDF document text
    • http://files.malilab.org/uploads/1/3/1/0/131070442/3c347714b24a1c.pdfIn PDF document text
    • http://files.redeemerfortbend.org/uploads/1/3/1/4/131438474/8847685.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/1/0431/5129/4628/files/dababusafowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/63294886012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/the_killers_bones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/guverilonulenoxef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/sidiganomajelokujumawonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3233/6791/files/cultural_diffusion_activity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/figozisevawevuwimutomul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0554/0509/files/94250927340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/95230405501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9191/7989/files/boxing_training_program_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/buwukepenarunowara.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9300 5424 bytes
SHA-256: 13c9024d944e01e5807809254186082e96ef66171fb9fd1d3bb82cb175fd7287
font_01_sfnt_off0000a562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA562 10648 bytes
SHA-256: 6d71d9d741a972436ef8188c85268aca8f3a0450fbbe5f615311486af44784ed

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