Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1913fa2088ae1c8…

MALICIOUS

PDF

48.9 KB Created: 2020-07-27 01:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9420d2b3ac255df6fb594a767c7bf8eb SHA-1: d7c06b334e9bc024413074cf9b3d0a5268904663 SHA-256: c1913fa2088ae1c89676ce56219815f1688d1b8276bd673f73ac12b2dc68c819
202 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'redundancy letter template hk' and embeds numerous links. One critical heuristic indicates a malicious redirector link to 'ttraff.com', which is likely used to funnel victims to further malicious content. Another heuristic flags a large number of external PDF links, suggesting a link farm for SEO poisoning or traffic generation. The document body, though heavily obfuscated, contains keywords related to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=redundancy+letter+template+hk In PDF document text
    • http://files.labcharter-pto.com/uploads/1/3/1/3/131379434/4b32ad6.pdfIn PDF document text
    • http://files.zamjesuitscovid19.org/uploads/1/3/1/3/131382387/rewifat.pdfIn PDF document text
    • http://files.palermiscollection.com/uploads/1/3/1/1/131163740/382a3027.pdfIn PDF document text
    • http://files.exsightcapital.com/uploads/1/3/1/4/131453214/5501348.pdfIn PDF document text
    • http://files.grapevinerealty.com/uploads/1/3/0/9/130969385/0fa37b4fa2.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/1/0432/0568/9504/files/xelereganujax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/93820075470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/24428429682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/punupedodiduvutigefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/24163509016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/51353160255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/zepob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/56457891563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/82991313084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7991/5937/files/23371258614.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 8

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_off000081f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 5032 bytes
SHA-256: 7cdbba9295bd25d883e04b7a166f8b40727366646c369c4a6a1d2e8a9f27ae68
font_01_sfnt_off000092dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92DD 10564 bytes
SHA-256: 7f7b48af5e4898a49c0c1e6297236d5831c091e7d5e725f4849f56b229f3d70b

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