Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43c806cf14067d…

MALICIOUS

PDF

45.0 KB Created: 2020-08-07 02:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e61bcd7ae99befd56305c3bb2dc36bbb SHA-1: dd338991f7c0b00d0b401fa74b4a176325711b58 SHA-256: ef43c806cf14067deea471105f6fd062275f3f622a33372f90546782c1982b15
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'formal and informal email writing pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious links. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports the malicious intent of redirecting users to potentially harmful content.

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=formal+and+informal+email+writing+pdf In PDF document text
    • http://files.allendaleinsurance.com/uploads/1/3/1/6/131607163/mupevojizamufowike.pdfIn PDF document text
    • http://files.esteefilm.com/uploads/1/3/0/8/130874477/nanipe.pdfIn PDF document text
    • http://files.truromass.org/uploads/1/3/1/8/131856247/7500713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/alkenes_and_alkanes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/wejiritadididuzo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/dagevosotubikopow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/disoganewer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/pupuxanuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/pokugalazupeviwufarosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/28967935158.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/fukixewidogeruwipadup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/vawunugomazukiriz.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 6

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F7 5016 bytes
SHA-256: 5f764f1f2d5cbc09c52a293cbc9afbf60398d007c2493f412ac054d74392a203
font_01_sfnt_off000075f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75F7 10236 bytes
SHA-256: 44d9d3243cb26433e40eb81a4352eec69c20f63f80078400ebb21fbc2a1c115e
font_02_sfnt_off000098c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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