Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff916e3c7e821783…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: eda1ecd1f0abda06352243805b209da4 SHA-1: c815d3c0d4eb2fee4c291d98e10c125704999770 SHA-256: ff916e3c7e821783fc703d65dd42be12002ba7d6e2917428545af06dabbc11ff
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to lure users with educational material keywords, redirecting to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies the primary malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL and references to educational materials, reinforcing the lure.

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=edexcel+a+level+biology+notes+pdf In PDF document text
    • http://files.zureedolls.us/uploads/1/3/2/6/132681296/tajerotik_sudolol_sezagugorowav_zigafevotifog.pdfIn PDF document text
    • http://files.eurekamakingadifference.com/uploads/1/3/0/7/130739831/wenal.pdfIn PDF document text
    • http://files.chiropractic-now.com/uploads/1/3/2/7/132712505/melalosafu.pdfIn PDF document text
    • http://files.cchsapexams.com/uploads/1/3/1/4/131437378/kegibumebawubup_dimik_xakasajajotew_xugiwujebuf.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/1/0430/3526/3138/files/601152465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/vopiba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/wunalojuxawet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/vuzorefagapelupusoresowag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/lelisotegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/tozumawaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/vaviwaroxopisasopodejix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/diwizunuwesiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/18160309198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/mewekozuxazigaxow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5251/4979/files/salinivedijimumalepinegit.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 6

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_off00006724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6724 5556 bytes
SHA-256: 1dcbfd2228828bac238a36b2f568d5cf522a1a1adeabc4aa45fc59dc96d21d16
font_01_sfnt_off00007a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A30 10380 bytes
SHA-256: fc9d9828a5ed821e37d6388cd3aedff4fe67f92cec3aca2b76840fc416c8e2e6

Open this report in the interactive analyzer, or submit your own file for analysis.