Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b6e981f5d3e2db…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 20:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7d4a0c1c5dda5a32881928f9bf1db70f SHA-1: 4898edc06c04b8bcd9d7a691318e80ffcca5c841 SHA-256: 24b6e981f5d3e2dbdfdd312e25c4b6213026ca52e8de83f209003c5550df25f4
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=percentage+increase+and+decrease+word+problems+pdf'. The document body, though heavily obfuscated, contains text related to 'percentage increase and decrease word problems pdf' and references the wkhtmltopdf tool, suggesting a lure to disguise malicious content. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential SEO link farm or a method to distribute 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.ru/pify?keyword=percentage+increase+and+decrease+word+problems+pdf In PDF document text
    • http://files.kristysinsara.org/uploads/1/3/1/4/131453060/dafesefe.pdfIn PDF document text
    • http://files.chromecomputers.net/uploads/1/3/1/4/131438843/wewiwimox-zurajefenefuj.pdfIn PDF document text
    • http://ruxiku.kathrynsantaphotography.com/uploads/1/3/1/3/131383483/534e884e7.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/1/0433/4557/6088/files/67497062257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/tedewiretozopabuvis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4099/5490/files/32025296919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/39254512814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/bankart_repair_rehab_protocol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/hindu_predictive_astrology_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/aiag_cqi-_8_layered_process_audit_guideline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1725/7628/files/52591825194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/52397000087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/69873669362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/add_two_numbers_linked_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/xelulolibeketafivujix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B8 5708 bytes
SHA-256: bedb4a4fd15c5f8bee059728ab23cc36a6c8203af6d7a5412eccaf14e199f245
font_01_sfnt_off00007c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 10800 bytes
SHA-256: 352386aafbf553ecb106cb22455777ade1039412cf876b47a542f79a7339c974

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