Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf9723ba0d23b23…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 17:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f682298854bbaed53c9ab7b0728b5ae7 SHA-1: 4d650cb2cfabfc93a8dd7694e792b7f5fcc41d5a SHA-256: acf9723ba0d23b230d60c090c4297fd24dfe64419e2a397a1c64fe6c404a89c9
152 Risk Score

Malware Insights

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

The PDF document contains a link disguised as an Ofsted report, which redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies this behavior. The document body, though partially corrupted, contains the lure text and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=grange+park+school+hayes+ofsted+report
    • http://files.pipehouseplayagrande.com/uploads/1/3/1/6/131636988/masivefurus.pdf
    • http://files.mjkoos.com/uploads/1/3/0/7/130738712/jenikulipuzerat_nufuto_dutotepini_munuwoxinit.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/tukosepaxim.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/belinuwuliresevudaxogiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/canticorum_jubilo_organo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/watefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/59016357606.pdf
    • https://cdn.shopify.com/s/files/1/0431/5093/4173/files/kajuxitadefuvapusajujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/how_to_hear_yourself_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/50840426016.pdf
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/initial_stage_crossword_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9361/files/veterinary_clinical_pharmacology.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/manntra_pressure_cooker.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/frases_comunes_en_ingles.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eeb.bin
8df708464b8dc24701cb7fda7dd344c39ed1ddac9600f9148812f92fc62d0a7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEB 5616 bytes
font_01_sfnt_off00007207.bin
7afcb27a00c6ef810dadbbd917d2644b254647b3cb1ef75c38728acdffd087f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7207 12400 bytes