Malicious PDF — malware analysis report

Static analysis result for SHA-256 99889835fc0a1817…

MALICIOUS

PDF

41.1 KB Created: 2020-08-22 16:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 75a583ff6e99789d8aaf57695713ac95 SHA-1: 53eda54a0c2179d97a216472508aa1db9fbebef4 SHA-256: 99889835fc0a18177cd27f56e365e15ba36b158df551f0d3f6edfd7104fb7165
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to a '360 degree performance appraisal feedback form' and includes the malicious URL. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious redirector. The primary malicious IOC is the redirector URL.

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.cc/pify?keyword=360+degree+performance+appraisal+feedback+form In PDF document text
    • http://files.chargingmoosemedia.com/uploads/1/3/0/7/130738876/repidoziw-karosewilulosin.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/1/0436/1755/0499/files/18848518294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/daguzetuti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5199/1719/files/frankie_swimwear_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/bra_ket_notation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/princeton_review_sat_practice_test_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/the_falling_leaves_poem_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2816/0418/files/autocad_lt_2020._1_update.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/ad_d_to_5e_conversion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3468/0216/files/xogajiwopez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/pabovomixovogasebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/62346149247.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 1

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_off00006035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6035 6044 bytes
SHA-256: 64e720a0099f8d8e41de1de2cde3be2100a388721b8f8e92e4a4a9ea951aeaff
font_01_sfnt_off0000749d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749D 10284 bytes
SHA-256: 6de7c0c322dea9f3b806e06411718dc164846f0929b865f2d116293b44f522ed

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