Malicious PDF — malware analysis report

Static analysis result for SHA-256 357a66b6f1fabd26…

MALICIOUS

PDF

45.8 KB Created: 2020-08-27 23:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 75716f84e5d003ea4ad0ed14706119c8 SHA-1: 73990118d93a0d59251926ba4a920eef28701710 SHA-256: 357a66b6f1fabd26c399056ab645b6846aa6536d7b337ef76d5a911a07dcc48d
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a link farm. One of the primary links directs to a known malicious redirector service, ttraff.ru, which likely serves to obfuscate the ultimate malicious destination. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.ru/pify?keyword=esquema+de+adoracion+al+santisimo+sacramento In PDF document text
    • http://jixosak.kansascitywriters.com/uploads/1/3/0/7/130738706/8241048.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/1/0430/5115/5618/files/55640240641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/rizotemuwepigojegosoref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/free_annotation_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/rujoxoruvijixadadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/xazedivodafinofopola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/vajutujupafipofukanuwow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9872/4769/files/tumimezuwovaful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1009/6284/files/terutirijatugoga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1477/3147/files/tatetagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/susak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/bidetenegaxexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/titeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/derixurasutofifemudepafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9978/1275/files/49779526361.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_off000071f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F2 5168 bytes
SHA-256: b09cbf1eded49890506ee33618a9293669e765926324bdb09016a4aec12580c1
font_01_sfnt_off0000836a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836A 11484 bytes
SHA-256: 4f181a98d9cb2aa81395b6df50f24080d6ee71d3d5cd65cd8683fb8b52c37ebe

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