Malicious PDF — malware analysis report

Static analysis result for SHA-256 833cd5ad0bb876dc…

MALICIOUS

PDF

36.7 KB Created: 2020-08-10 23:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 055dcd23ae6f8f57d4984eb17f3ca2db SHA-1: b7950925323941991693d3ef472461030de3d8db SHA-256: 833cd5ad0bb876dce98da78cca76dd2413fbdfa05f44dabb380a9f991c6678f1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) which is flagged as malicious. The document body and embedded link farm suggest a tactic to drive traffic to potentially malicious sites, masquerading as free downloads. The ML classifier strongly indicates 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.com/pify?keyword=academy+stars+5+pdf In PDF document text
    • http://files.gatewaybruins.com/uploads/1/3/1/0/131071312/razom.pdfIn PDF document text
    • http://files.ess-inc.com/uploads/1/3/2/3/132303229/goturisipure.pdfIn PDF document text
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.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/1/0432/8092/4840/files/zeboxuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36103472339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/cengage_physical_chemistry_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/interview_questions_for_cabin_crew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/path_of_exile_ranger_build_beginner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6515/4463/files/how_to_push_a_file_to_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/rpsc_steno_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/programming_abstractions_in_c_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/bombay_blood_group_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3469/6097/files/acidosis_metabolica_con_anion_gap_normal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3745/7574/files/lijakirar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0138/6920/files/94229958153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/canadian_citizen_application_form.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_off000050ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50AC 5484 bytes
SHA-256: bf38962f63fc7e00cd827fd27b0c1dfd98ea5674068b72bad7828034a2fa6f00
font_01_sfnt_off0000634b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 10212 bytes
SHA-256: f263122e92c16abcf83f2090a2d62724df746cc951ed33549af9c9038051f8e7

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