Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f39341e4702842…

MALICIOUS

PDF

59.6 KB Created: 2020-08-04 01:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d302ed087579557778af7ae183188477 SHA-1: 57763a40c38c33565554095590e4e8b22bddc3e0 SHA-256: 81f39341e4702842a636d8390ca37a7ea3a6841264e93ff1cfe14c6703ec0b57
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to an SEO redirector, specifically `https://ttraff.com/pify?keyword=appendicite+aigue+pdf+2020`, which is flagged as malicious. This indicates the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution. The presence of numerous PDF links suggests a link farm strategy to improve search engine ranking for malicious content.

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.com/pify?keyword=appendicite+aigue+pdf+2020 In PDF document text
    • http://files.harveystringteaching.com/uploads/1/3/0/7/130775561/fevazijivofukilug.pdfIn PDF document text
    • http://files.scqhaqueen.com/uploads/1/3/1/4/131482997/9211b29c54.pdfIn PDF document text
    • http://files.5degreespsychotherapy.com/uploads/1/3/0/7/130739004/5077372.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/1/0429/2041/1303/files/vuwiborasobajebowiba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/7495933264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/fekulimokatutanaguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/xevirewivesigatokuki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/fozibexan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/getting_to_yes_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/mabura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/58733691863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/jobukasolegaba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/57441563918.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: 5degreespsychotherapy.com 3 samples

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85DE 5280 bytes
SHA-256: d031fbb9611487d00270175c3ea5a46ff95d2591f39fb03d3b24bf45d7c4862d
font_01_sfnt_off000097f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F4 16772 bytes
SHA-256: 4ab1c263e55236bd7bd820293f8fa45ccc3c44dd60d894732524dced8e1bee23
font_02_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501