Malicious PDF — malware analysis report

Static analysis result for SHA-256 8949c7804d31e65f…

MALICIOUS

PDF

51.8 KB Created: 2020-08-06 13:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23cb5f58d3346261849cc03f251e582 SHA-1: 4f22bf8d8fb47337a4f5453787f446ef371b2456 SHA-256: 8949c7804d31e65ff3c3c20c7e58bb825339129accce5dfc80801734702acfde
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, such as 'https://ttraff.ru/pify?keyword=formulas+in+excel+sheet+pdf', are likely part of a campaign to lure users to malicious sites. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and embedded URLs, reinforcing the finding of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=formulas+in+excel+sheet+pdf
    • http://files.goldenbeemx.com/uploads/1/3/2/8/132814415/tukamejamotuvolaju.pdf
    • http://files.nclbl.org/uploads/1/3/0/8/130874007/napevo.pdf
    • http://files.ricepaperdesigns.com/uploads/1/3/1/0/131070751/626a1.pdf
    • http://pofigorut.eliteheatbuffalo.com/uploads/1/3/2/6/132681579/1859894.pdf
    • http://files.myfairladyministry.com/uploads/1/3/0/9/130969577/bebapi-pemufosagove-mizozar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/gadepasuwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/fanotepiluwete.pdf
    • https://cdn.shopify.com/s/files/1/0437/8610/9086/files/acute_abdomen_articles.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/50723545393.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/moparasapufujufowur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/6611740547.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/66231780247.pdf
    • https://cdn.shopify.com/s/files/1/0435/6508/8917/files/7619584339.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/passive_voice_continuous_tense_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/aprender_ingles_rpido.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/zojadanotazulimul.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/tozobororoxeninanapabud.pdf
    • https://cdn.shopify.com/s/files/1/0435/9120/5021/files/67090919442.pdf
    • https://cdn.shopify.com/s/files/1/0434/9332/7008/files/momebo.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_off0000731c.bin
a498eb71531894972e374c8723bde206ddd0a32b9a0b8869935567444384f338
pdf-font-stream PDF embedded font (sfnt) at offset 0x731C 5300 bytes
font_01_sfnt_off000084f8.bin
6294ba55005f83a66cfd9dba6621f16fba70fcb25f4645e9f3fe09d479ec23b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x84F8 15136 bytes
font_02_sfnt_off0000b401.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 4324 bytes