Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c39551ef3d49522…

MALICIOUS

PDF

40.0 KB Created: 2020-08-21 05:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2844b2da7f6d7a2356fbc7baaa2da098 SHA-1: 99e1800330d5e13e0c01fe3cda0ca4325e6f6704 SHA-256: 5c39551ef3d495229b009d3ba3cca35262283ff66870faaa9150d1ae93833ab1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting a lure for an 'android app' download, aligning with the 'free-download phishing' heuristic. The presence of a large number of external PDF links suggests a link farm intended to drive traffic to malicious infrastructure.

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=gamerz+lounge+android+app In PDF document text
    • http://files.kelseymedeiros.com/uploads/1/3/1/0/131070317/09fbf9a.pdfIn PDF document text
    • http://fidufide.jensensrvpark.com/uploads/1/3/1/8/131857758/lulazerodi_topofigubopopu.pdfIn PDF document text
    • http://komaz.tommainwebsite.org/uploads/1/3/1/8/131856158/xudebevironadoreri.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/1/0428/9105/1161/files/pobaxidavabixobupananagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97503793953.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/3220/2651/files/xuxokomaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/59750171615.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/searching_and_sorting_algorithms_in_data_structure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/evermotion_archmodels_41.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/bafaxelumowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/39286188312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4691/8551/files/social_factors_affecting_consumer_buying_behaviour.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9293/2763/files/76418515211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/30680234643.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_off00005db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB7 5184 bytes
SHA-256: 5bba133374e5896fc14077687fd9d97959f641bcee1e88054745aa6db597d7dc
font_01_sfnt_off00006f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 10604 bytes
SHA-256: 4b38367fce1b3daf985dd075ee8560b862f48dc281b9f3ece28f069ccc53e364

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