Malicious PDF — malware analysis report

Static analysis result for SHA-256 503bba40f21fcd47…

MALICIOUS

PDF

44.6 KB Created: 2020-08-05 10:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 52a3e78203380cb49f197bbedfbe3428 SHA-1: d629fdb7ed0d1b71e63d0b913c53d879d621b987 SHA-256: 503bba40f21fcd478668e94c794412b021dac0a66e0724b18468de681f714139
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of the primary links redirects to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though partially corrupted, contains text related to pneumonia treatment and the tool used for generation, suggesting a lure to disguise the malicious intent. The presence of numerous external links indicates a strategy to distribute traffic to potentially harmful sites.

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=neumonia+en+ni%25C3%25B1os+tratamiento+pdf In PDF document text
    • http://files.bonnystaufferart.com/uploads/1/3/1/4/131483110/12d92b7af2729.pdfIn PDF document text
    • http://files.sanmiguelcorner.com/uploads/1/3/1/4/131453395/puwedaxeb_bebulisobij_vubumivip.pdfIn PDF document text
    • http://files.fringeboutiqueto.com/uploads/1/3/1/3/131398000/xedepogozirok-vilut.pdfIn PDF document text
    • http://files.canwestclaims.com/uploads/1/3/0/7/130775182/4846903.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/1/0428/9835/8432/files/kofuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/gajat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/70143012783.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/gobalebidov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/97485962789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2207/3508/files/carl_jung_red_book_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/underworld_meg_cabot_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/70877109271.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/vabiwiwu.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 7

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_off00006d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D72 5336 bytes
SHA-256: 6af111887d4b919426a7177afb4e19507ee2006b9ac556fa102a526229519f16
font_01_sfnt_off00007f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F42 11220 bytes
SHA-256: 84dead0b3732d20663602262f0262177d9bb1f68c28855eb900b89c4d529e77d

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