Malicious PDF — malware analysis report

Static analysis result for SHA-256 1985c2d725a4f141…

MALICIOUS

PDF

57.8 KB Created: 2020-08-09 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4f728bb7eb0b5c9858b54a535710e39f SHA-1: 31a3abf50d1ab8a397aad8ce2174bdc582446188 SHA-256: 1985c2d725a4f1412cf12e5821c0f1036eae9428d2b539bce02323d71970c6e0
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) that appears to be part of an SEO link farm. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it's the primary lure. The ML classifier strongly indicates maliciousness, and the PDF structure with multiple external links is consistent with phishing or malware distribution tactics.

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=interpretacion+electrocardiograma+enfermeria+pdf In PDF document text
    • http://files.cvpeyamaha.com/uploads/1/3/0/7/130740563/bemorosafavi.pdfIn PDF document text
    • http://files.woodstockumc.org/uploads/1/3/2/7/132740187/dogejo-fepako-gosesibubeloka-dekem.pdfIn PDF document text
    • http://files.themoundcityslickers.com/uploads/1/3/0/7/130739263/11ebb56ab76ff.pdfIn PDF document text
    • http://labeg.ibelieveinbirth.com/uploads/1/3/2/6/132682646/tumopave.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0431/5122/9089/files/migazisajujuvuguzujedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovogosiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/15494964647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/8790/8264/files/apicultura_argentina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/hebrew_english_transliterated_bible.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/kesibefamazofeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/naduxategalelibejuviwumif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4882/7040/files/bexoripirazuvot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/1526123691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/rofadali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.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_off00009318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9318 1872 bytes
SHA-256: 31c540d11144f4345156f451af9ba389a1131d21873ea1c3280cece25ef53112
font_01_sfnt_off00009c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0C 5232 bytes
SHA-256: c015c4754e9298e05c577c4eb9d1e5cd5510de9e37e46febec26f5c8d1f29a81
font_02_sfnt_off0000adc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC4 13816 bytes
SHA-256: da0ca65277e1aa8ca63d7535a46047d9c12dc9e0bc8a092af8e4afebddcac2a3

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