Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d62b916115ed0f…

MALICIOUS

PDF

35.6 KB Created: 2020-08-17 06:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 67e67272ad6e12e912e2620aa34aede6 SHA-1: 2443fba277fa6c85739431b835d2e872129e63f8 SHA-256: d4d62b916115ed0f2aa7a53929efe38f45ee38ee3fe0405720d2e1cfab8448c0
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, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is part of a link farm. The document body, though heavily obfuscated, contains the same malicious URL and references 'free colouring sheets lol dolls', suggesting a lure. The presence of numerous Shopify links, some confirmed benign and others unknown, indicates an attempt to blend malicious links with seemingly legitimate ones. The primary attack vector appears to be social engineering via a deceptive link.

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=free+colouring+sheets+lol+dolls In PDF document text
    • http://sowes.alankendallmusic.com/uploads/1/3/0/8/130814328/warakewesadetiximego.pdfIn PDF document text
    • http://kinur.letterstolawyers.com/uploads/1/3/0/7/130775918/wanem_gokozedenadipo_jizudiluzo_kuwevewet.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/1/0431/1266/1152/files/96381745900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5199/1719/files/26127436208.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/vaxazer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/57245697281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/besatetaxivanenuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/phylum_cnidaria_characteristics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/xemabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/corriente_pedagogica_definicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/glenn_vilppu_drawing_manual.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
🗂 Part of campaign: letterstolawyers.com 4 samples

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4E 4944 bytes
SHA-256: 822a256e3224291a82deb86c085ce3b860d48bf06865ece022c737417b46408a
font_01_sfnt_off00006011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6011 10008 bytes
SHA-256: 8edc4cae7c1e80cd41d44791654b4e8ee956f4c124affe709d71feec99d1f08a

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