Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5526c9941c09c34…

MALICIOUS

PDF

46.0 KB Created: 2020-08-11 23:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15f25d50e39eac15a80b8c5e689e3a69 SHA-1: 51d8ee7eeaf0a956633ac1a3ecdf672f4ee35bff SHA-256: d5526c9941c09c34d60eedc033d5633fa5d16431c3465c769b2ccdb8bd37fc4c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links, including one to a redirector, suggests a link farm or a lure to malicious content. The primary malicious IOC is the redirector URL.

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=m%25C3%25A9tabolisme+azot%25C3%25A9+pdf
    • http://buguw.goto2025.com/uploads/1/3/0/8/130814328/2691881.pdf
    • http://files.dopeinccs.com/uploads/1/3/2/8/132814168/wipabik.pdf
    • http://begatuf.thehealingplacetasmania.com/uploads/1/3/1/4/131411896/b020c.pdf
    • http://zumozixa.jingshuw.org/uploads/1/3/1/3/131381489/gexetitubivuv.pdf
    • https://cdn.shopify.com/s/files/1/0438/7989/1099/files/aleister_crowley_o_livro_da_lei_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/geludobadixiwemawar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/bozobolirigokipalulunova.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/adobe_reader_for_pc_exe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/modo_marbel_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/45524700483.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/77331431905.pdf
    • https://cdn.shopify.com/s/files/1/0437/4849/1415/files/2109664044.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/kitchen_ergonomics.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/menoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76106621034.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_off00007034.bin
c2142a4dbb1f8bd10e59a0ad34093f3649c2ec704ccc363626ddb6999ad18d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x7034 5428 bytes
font_01_sfnt_off00008261.bin
8324c57dbe3b70ace2f35c6a16a4d34404c7ed59c36033c4243ba19c90385831
pdf-font-stream PDF embedded font (sfnt) at offset 0x8261 12580 bytes