Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df02530cc983e5d…

MALICIOUS

PDF

54.8 KB Created: 2020-08-07 00:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c62865d1f4438054e8021ba87543d55c SHA-1: fa17d5c089cc03b87d5948c6bb7480163a6c857f SHA-256: 8df02530cc983e5d7fca7fc9cb1613cbd4469102f893d926fb8a42b05d935b14
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains text related to 'free acoustic guitar tabs pdf' and references the wkhtmltopdf tool, suggesting a lure to disguise malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful sites.

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.ru/pify?keyword=free+acoustic+guitar+tabs+pdf
    • http://feten.liladala.com/uploads/1/3/1/4/131407406/1629863.pdf
    • http://files.mickylynnsroom.com/uploads/1/3/0/7/130775892/1204bc292627.pdf
    • http://files.sumasacchurch.com/uploads/1/3/0/9/130968958/petenekemeki-merolimejanimi-xitoxabarizoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/fonabufanoputamunixalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/33780912445.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/96353902788.pdf
    • https://cdn.shopify.com/s/files/1/0439/3356/5096/files/10681126471.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/viruvekeruxupamiderukow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0443/9543/0054/files/losozuvoriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/15606056397.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/91743402879.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/10655075871.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/pokemon_blaze_black_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/lojorimiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bb8.bin
4dba6a2b7ac4e28443fcdefd8170990b87fe40ef09b04e9d3b90927e49d6b1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB8 5160 bytes
font_01_sfnt_off00009d53.bin
6f706de366ec05bfd52857c952728ec87da110dee00d3c93e42145cecbd70760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D53 10192 bytes
font_02_sfnt_off0000c02e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC02E 4324 bytes

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