Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd78e1df41b644…

MALICIOUS

PDF

51.8 KB Created: 2020-08-10 21:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd99983533c043f696dcc88014689f0b SHA-1: 91676b0a6cbd729b2c692f3e87cd474fb8cf2f3d SHA-256: a0fd78e1df41b6440cc7bb839f8e7e312000aa490fdc9133fae5ee9093ab65c5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, suggesting an attempt to generate traffic or distribute content through numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body itself appears to be malformed or obfuscated, but the embedded URL is clearly visible and leads to a suspicious domain.

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.com/pify?keyword=pedagog%25C3%25ADa+definicion+pdf
    • http://files.laviishluxxe.com/uploads/1/3/0/7/130775942/1a41a3f.pdf
    • http://files.totteytreats.com/uploads/1/3/0/9/130969494/muxikup-sopugelizo.pdf
    • http://wapawuki.optimalwellnesslab.com/uploads/1/3/0/8/130814017/bivewakes.pdf
    • https://cdn.shopify.com/s/files/1/0440/2790/4165/files/sociology_anthony_giddens_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/bogufegigug.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/64873831886.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/66508840302.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/50117167507.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/sanyo_air_conditioner.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/72023625380.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/fovaditi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/suwutapenerevasul.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/zibuvififuxog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/989_fairfield_beach_road.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_off00008a91.bin
93ccb7dbf7cec8160e11340890e3082fe832fd06c5a6a53ee8fc189293dfafdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A91 5072 bytes
font_01_sfnt_off00009beb.bin
54bfe85b0fc6e16baa37f826e7baabc4dd2609806c01c94d56066081a4dfe3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEB 11240 bytes