Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba0df4c299a3a4…

MALICIOUS

PDF

32.7 KB Created: 2020-08-26 08:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b3531cd0fc36bd44d6f00bcb1fc4315 SHA-1: 13e27911e52981d595354178d4bb954befbd0fde SHA-256: 82ba0df4c299a3a45eff951de282388ae3f00c7b78e94172bfdbb5fbc7bfd00c
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic match for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same URL as the malicious redirector. The primary attack vector appears to be social engineering, luring the user to click the malicious link under the guise of educational content.

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=english+grammar+multiple+choice+exercises
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4392/files/17573925283.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/vuzepugakodofuwibaputobap.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/direct_speech_worksheet_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/historia_del_abencerraje_y_la_hermosa_jarifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/75761810697.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/86573188552.pdf
    • https://cdn.shopify.com/s/files/1/0428/4225/9612/files/tifejaziluzezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/kaxexelojabatogajazomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/45687144.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/52690086480.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_off0000410c.bin
086a2dbc8ff0a9fc45155e2896c83cc3d067e2226dd1e79e2364d8ae8b6694dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x410C 5372 bytes
font_01_sfnt_off00005328.bin
bc5c41ad9b10f1a02a7ad0b051da2f22a835da4506a7d2519a5f201d367cd0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5328 9756 bytes

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