Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f82adb3903a563…

MALICIOUS

PDF

54.8 KB Created: 2020-08-04 09:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 680b0f733a86a920aa08e9d3bfd231c0 SHA-1: 525c29b1484769e0985d44046f922fb8a9fd4c6d SHA-256: b5f82adb3903a563e2a1ddb93290c288b7573d18c5641219374b0e582ca38654
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.cc. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious infrastructure. The primary malicious URL is https://ttraff.cc/pify?keyword=zhang+bounded+gaps+between+primes+pdf.

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.cc/pify?keyword=zhang+bounded+gaps+between+primes+pdf
    • http://files.houstonbottledwater.com/uploads/1/3/0/9/130968950/pawipimig-vegiv-sukok-selalix.pdf
    • http://files.fionacompton.com/uploads/1/3/2/6/132681824/tulotezeniramo_wobalefadan.pdf
    • http://files.neubacher.vafercapital.com/uploads/1/3/1/3/131383284/580442.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/91291398522.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/14356502710.pdf
    • https://cdn.shopify.com/s/files/1/0431/2544/0669/files/wofomugukinuvurori.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/mumefilopizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0435/3291/0751/files/72735696488.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/29427567487.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/35195001757.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/25724738500.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/86829677148.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_off00006413.bin
2120e061286f6847194a77f5faf915109d730e5dfe7290553a6017bfce34888c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 5496 bytes
font_01_sfnt_off000076a5.bin
39b78b9d96fd4c55f8fa20550ab8d844b70443a90c390f3123ef92ae442876e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 16040 bytes
font_02_sfnt_off0000aa97.bin
54c7454e0e37581c45996c00fec06e5e014cecb1b2e003ccf0ba466df70b3344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA97 16236 bytes
font_03_sfnt_off0000bff5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 4324 bytes

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