Malicious PDF — malware analysis report

Static analysis result for SHA-256 257ed49034537bfa…

MALICIOUS

PDF

46.9 KB Created: 2020-08-05 11:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3595b78607219d5b556234ecdd4451e3 SHA-1: 441964c2b32a5321fd66fed69c349b8ae427435f SHA-256: 257ed49034537bfa1d30dfbc6b012dbb9464386fe0aa0fec85b66ed3f77e4e85
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), and another noted a large number of external PDF links, suggesting a link farm or distribution mechanism. The document body contains garbled text but includes the URL 'https://ttraff.ru/pify?keyword=akreditasi+universitas+negeri+malang+pdf', reinforcing the malicious redirector finding. No scripts were extracted from this sample.

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=akreditasi+universitas+negeri+malang+pdf In PDF document text
    • http://files.designtimegnc.com/uploads/1/3/0/8/130874139/2354841.pdfIn PDF document text
    • http://files.runningwildusa.com/uploads/1/3/0/7/130739238/7449806.pdfIn PDF document text
    • http://files.photographybydennisj.com/uploads/1/3/1/6/131606965/9746010.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/1/0433/3273/1038/files/zetutofotojutisojewumuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8296/3349/files/88785607136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/44506869153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/82033805863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/robstown_topix_forum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/7897/0533/files/que_es_la_anuria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/13086693785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/pharmacologie_de_l_appareil_respiratoire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2717/7365/files/begoxuvutetiwinaxogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0356/7515/files/77345082610.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000688a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688A 5472 bytes
SHA-256: 10a42c9c62f861307a20a7131dd8bfe2bd1e540f224d5095ed48ba82051c6880
font_01_sfnt_off00007b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B18 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000083a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A6 13496 bytes
SHA-256: 232a8ec33390172f986a457cbe3a9962ecb91078316b28f0b9c714dc94a4593a

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