Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37d444d6c0a1f38…

MALICIOUS

PDF

44.2 KB Created: 2020-07-29 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a3d0e49dca98858a4e1da08dc69b6e57 SHA-1: f162249f74bc3c82ba193a035a1f1755018e1877 SHA-256: f37d444d6c0a1f3893e389daada2461474bff625b06779ea8bf369834a61b3f7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'mathematical aptitude questions and answers pdf in tamil'. The PDF_SEO_LINK_FARM heuristic further suggests the document is part of a larger scheme to generate traffic to external sites. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=mathematical+aptitude+questions+and+answers+pdf+in+tamil In PDF document text
    • http://files.cravecavevaporlounge.com/uploads/1/3/1/0/131070313/konovinexi.pdfIn PDF document text
    • http://files.silviatomarchiophotography.com/uploads/1/3/1/4/131437139/fukuzof_kogagixita_wisev_dupuxo.pdfIn PDF document text
    • http://files.holytrinitywytheville.org/uploads/1/3/0/7/130740563/wuliva_woboxefine_zenetudidawoti.pdfIn PDF document text
    • http://files.englishzero.com/uploads/1/3/1/4/131437443/007ccb033f9533a.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/1/0432/8125/2512/files/juwulizuwixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/63093568811.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/96558749248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8023/4661/files/siwuwevusivol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/89376349398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/zefukozusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/24247214586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/nagusegorogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/jukajafawifulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/razuwekemogikusuwipetudem.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 7

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_off00006ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 5500 bytes
SHA-256: a5f7a01863a0a1ba190fadc0d62c376c2bbc9024028c776fe856d7476344127e
font_01_sfnt_off00007d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D52 11216 bytes
SHA-256: 8e16420f6d82bf142fc3fde50db4cf01df9e48a4b2ce8549d872ca6940e8de93

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