Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52d733c1651c8d0…

MALICIOUS

PDF

65.6 KB Created: 2020-08-28 00:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0880b25b876a5456dc83065a126e3150 SHA-1: bc2e395860122d394f5c7ae837e38dc49637319e SHA-256: f52d733c1651c8d04a1cfc67cb873649f3a9d593d3071a730652dde64343cee1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body contains text related to 'Csr2 tier 2 best car' and the redirector URL also includes this keyword, indicating a lure to attract users interested in this topic. 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.cc/pify?keyword=csr2+tier+2+best+car
    • http://files.pianowithmindeek.com/uploads/1/3/2/7/132740900/74838.pdf
    • http://files.pnowebgap.com/uploads/1/3/0/8/130813639/7660659.pdf
    • http://files.mindandheartlab.com/uploads/1/3/1/4/131414743/zufetoroxanipa-nidexisezurav-tukeniwijudoven-sidabupabixilub.pdf
    • http://xuxoduk.texaspotofgold.org/uploads/1/3/1/4/131407089/nedesogivaguvet-lipoxilaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/rumupiror.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/15978276846.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/76731961745.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/65505875959.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/35730092203.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/17067015924.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/rusimovomonuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/71812425605.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009733.bin
eeb7b03453285f857069dc4bb864fb74b4af1be6fb3eb0a26d4422b23e0a7cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9733 4936 bytes
font_01_sfnt_off0000a7fa.bin
a63624556725da989d5575369fc72732f7947f3ff2e19f90c11246b26d016c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FA 2292 bytes
font_02_sfnt_off0000b249.bin
30df86e5a69e9a9a118adad2ac12de0a191780e8c6e641e15bb05ad5a46badf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 15220 bytes
font_03_sfnt_off0000e18e.bin
77a46605620985975e371a4d1ba7e1a23f2d6878e71b067ebe09fc51426f3e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 16764 bytes

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