Malicious PDF — malware analysis report

Static analysis result for SHA-256 161c55b02867e652…

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 08:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9877c4914cc1058ee514020261775fa9 SHA-1: bb522fb031e8a6a519825e3cec6b4917486b6b31 SHA-256: 161c55b02867e652a2daf7cc2b017449e8d1e8d31e9aa1eefc9e18bc29626ba0
194 Risk Score

Malware Insights

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

This PDF file contains numerous links to external PDF files, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, appears to be a lure for 'back rehab exercises pdf', suggesting a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=back+rehab+exercises+pdf In PDF document text
    • http://files.shupesontheboardwalk.com/uploads/1/3/1/3/131380308/9735450.pdfIn PDF document text
    • http://files.jonathanrockford.com/uploads/1/3/1/4/131483108/ed853a86e0a2.pdfIn PDF document text
    • http://files.ftmaagojuryu.com/uploads/1/3/1/4/131438216/9a71db1.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/1/0431/2920/8983/files/damodafufopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/waxokupufipogiviberurexof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/pivasexizelazokigov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/wabegujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/lezugeworu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/66168654090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/88327799344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/23838517462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pisanebemewamabojesodid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/24061755049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/suwetemudakuwugumazukami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4660/7765/files/tejasomora.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 4

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_off00007629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7629 5024 bytes
SHA-256: e03ea7cc38a3e2df6614cab4b8ba826ce0989bc6a92485468f95fb9fa4c1b77d
font_01_sfnt_off00008747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8747 9816 bytes
SHA-256: efa3e6dbcdfa245e3f2f09db69d8c14ac13d8349269240c5197d420ee74952a5

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