Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd3637b08909edb…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 18:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48832e209ef817274a0e7314670e4818 SHA-1: f4ac1b1df64def5a7fbaa194a5a1f20994d4f308 SHA-256: 2bd3637b08909edb70b56bef47072ee372509de96e80b3a50700b241a15310fc
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a reference to 'learning cursive font pdf', suggesting a lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains hosting PDF files. The primary malicious URL is used to redirect the user, likely to a further stage of attack.

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=learning+cursive+font+pdf
    • http://files.containerofdreams.org/uploads/1/3/1/4/131437306/2562830.pdf
    • http://files.reliableirrigationsystem.com/uploads/1/3/0/7/130776159/4480584.pdf
    • http://files.zuowenjie.net/uploads/1/3/2/3/132303163/ed091d.pdf
    • http://files.attotherapyus.com/uploads/1/3/1/4/131437725/9587862.pdf
    • http://files.friendsofpadrepio.com/uploads/1/3/1/8/131857338/naxetijulege.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/autoformation_windev_20.pdf
    • https://cdn.shopify.com/s/files/1/0433/9410/5509/files/nba_2k15_xbox_one_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/77537935673.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/48425994318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/3321418786.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/80346212261.pdf
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/mewizitegakemajofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/11120206039.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/zegemosotagexutenurowi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fdd.bin
0966214c366a3b40d81ce0af196745da74ca666e4f4ad2310140048ef4ff5bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDD 5292 bytes
font_01_sfnt_off000071ff.bin
5c11a25550858c09729e93711dfe9cd2e14f7c3e5323558959bd1051d18913ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FF 15216 bytes

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