Malicious PDF — malware analysis report

Static analysis result for SHA-256 638e6aaaf15d8910…

MALICIOUS

PDF

40.8 KB Created: 2020-08-21 20:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 28ef22b2dcb6f15f02ddd40005802cac SHA-1: 0bf4bebef5ac2559b677c7a6b73b28e74614de0c SHA-256: 638e6aaaf15d8910fee6ab1c132d8fd9d0d5ea054b52da731fc0cf5c426ec3f6
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a redirector infrastructure, identified as a malicious link and an SEO link farm. The document body, though heavily obfuscated, contains text that suggests a lure, potentially related to invoices or payments. The primary malicious indicator is the redirector URL, which is likely used to serve a second-stage payload or phish for credentials.

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.cc/pify?keyword=define+aging+report In PDF document text
    • http://files.elisebiersma.com/uploads/1/3/2/6/132695329/tudemegumebomi.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/1/0431/7003/7911/files/losokejokarujelakom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/85981292527.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4273/3208/files/23993036792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/sasofiguk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/infeccion_por_acinetobacter_baumannii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/interplay_the_process_of_interpersonal_communication.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/how_to_delete_a_trello_board.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/casio_g_shock_watch_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/bus_eireann_route_22_timetable.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 2

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_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 4856 bytes
SHA-256: 7262453d0828c1e30e643d1ed7387a29ba13dddfec23d70fab965990b27e1a3d
font_01_sfnt_off00007338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7338 10404 bytes
SHA-256: 945b3bb8cec1c8d5bda9345c29552984543a7bb630816d9ecfa3764b561721ea

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