Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a4e870f3dfc637…

MALICIOUS

PDF

46.4 KB Created: 2020-08-14 00:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 959962cf0ba1e87dc6fb6e0f8a9c2e78 SHA-1: 665bb36d244296e10e149b0dce459b5a57a1d2a6 SHA-256: d4a4e870f3dfc6378de536416b209e5078bd6f8bee70ddddf4c80a5981fcf47b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to the presence of a large number of external links, a technique often used to redirect users to malicious sites. One critical heuristic flagged a link to known malicious redirector infrastructure. The document body contains text related to SQL interview questions, likely a lure to disguise the malicious intent. The primary IOC is the redirector URL, which is likely the first step in a phishing or malware delivery chain.

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=kudvenkat+sql+interview+questions+and+answers In PDF document text
    • http://files.marshcreekmini.com/uploads/1/3/1/4/131483219/nijilamuj.pdfIn PDF document text
    • http://files.swe-rms.org/uploads/1/3/2/3/132302928/gikatofusenupo_vawepa.pdfIn PDF document text
    • http://nixoxasef.brettstotalstumpgrinding.com/uploads/1/3/2/6/132681670/fe1fb86b35251b.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/1/0434/1648/6040/files/miwipadukatiwuzugugege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/75316570126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/25485825002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/can_mobs_spawn_on_slabs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/define_annotations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/37054920040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/pulse_secure_vpn_for_windows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/9130/1286/files/apdcl_advertisement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/kebifiwuzik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/vedonelim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/android_app_stuck.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 4

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_off00007762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 5128 bytes
SHA-256: d94a5baa81c96781d418bb73e0ea12674763264483cdbb46c88a5c59290463bb
font_01_sfnt_off000088f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F7 10588 bytes
SHA-256: 75deb7778567d1c4124366194552fc6b52b844db144e1965088c527f91b2a626

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