Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2281a30619cc251…

MALICIOUS

PDF

52.8 KB Created: 2020-08-15 12:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ae1007f9d48daa50eb823eeddbdc91 SHA-1: 410547b22564f1eabb3d0133121c8ea8f78a4254 SHA-256: a2281a30619cc251749a6ad7d85466140375df60ad6028241f2ab066d5cb5e68
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=anand+kannada+movie+songs++320kbps, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise malicious content as a link farm for movie songs. The ML classifier strongly supports the malicious nature of this PDF.

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=anand+kannada+movie+songs++320kbps
    • http://tudafokak.allysonparsonsart.com/uploads/1/3/1/6/131606419/fff349184.pdf
    • http://files.dribrabestabortionclinic.com/uploads/1/3/1/4/131453053/b15a63d288b7d3a.pdf
    • http://files.krejov.com/uploads/1/3/1/4/131408027/5681931.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/20600642251.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/tizekaginedumoferofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/naduz.pdf
    • https://cdn.shopify.com/s/files/1/0439/1819/6891/files/jezioro_bodeskie_ksika.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/cardinal_signs_of_inflammation.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/keroro.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/wexaruzapabimetaxusima.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/23388779773.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/vumimajuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/nedadezivarepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/35317050532.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000797e.bin
4a10c57954d02dda0a7a9f0f1184f96d4ef38fe98be7cad78f1b1bb51ae84652		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797E 5548 bytes
font_01_sfnt_off00008c40.bin
c6d24fcf290c73a0008aee4cc6f238747379aefca049e06000a7bf4c22db85c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 14088 bytes
font_02_sfnt_off0000b82e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 4324 bytes

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