Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d65ab444c0814a…

MALICIOUS

PDF

40.0 KB Created: 2020-08-23 17:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f63a7815b58eae57072771d1f886914b SHA-1: f618035b3fad26e7d594c743aea973962d34a0e5 SHA-256: f4d65ab444c0814a7655fc0b542566c8e2a676936edaba082b5ed09fad0baedd
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'brain teaser worksheets' and the malicious URL, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

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=brain+teaser+worksheets In PDF document text
    • http://files.jeepinforjesus.com/uploads/1/3/1/3/131382217/vobesuvamituz.pdfIn PDF document text
    • http://files.karlielucas.com/uploads/1/3/0/8/130873921/1936102.pdfIn PDF document text
    • http://sodorutej.coastalacad.com/uploads/1/3/0/7/130776394/tuxawisepevabupilo.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/1/0439/2199/7979/files/navodaya_online_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/fly_sheet_clearance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/wifesud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/76440017012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/discord_webhooks_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4460/0999/files/organic_chem_lab_survival_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/29530059014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/vutokovabanaxifanuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/zaliwupudasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5984/6051/files/aci_sp_4.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 3

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_off00006057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6057 4948 bytes
SHA-256: bdce1047de51c1af9f6bec1fc5f5eb3aaa49cd55b72a05de33bd65e426028fde
font_01_sfnt_off00007135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 10060 bytes
SHA-256: 2256b4df3d078a0fc03364149c0b047e72c6337d10b9bad2d2991e4501cb4fa0

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