Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38e5c88b9be67f1…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 05:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68fa59a02891163d9b2ae3f23bc2392d SHA-1: 45579a7ba5ae947b26cb177aca89adb78ccbedd6 SHA-256: f38e5c88b9be67f176553dfeb808e020d4c522ff14d68c53ce23e861dbe19be0
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=examen+medico+laboral+formato'. This URL is presented within the document body, disguised as a laboral medical examination format, to trick the user into clicking it. The PDF also contains a link farm, suggesting a broader SEO poisoning or spamming campaign. No scripts were extracted, and the document body itself is heavily obfuscated, but the primary malicious intent is clear from the redirector URL.

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.me/wix?keyword=examen+medico+laboral+formato
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/73cb9e_ac47864b91154c289817f5f87a1e2911.pdf
    • https://static.usrfiles.com/ugd/856cea_2df91311f1cb4ca9bd0f92d31f38e74d.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6294/files/sesumilolenazogapeno.pdf
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/malayalam_balarama_stories_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5026/0890/files/free_piano_sheet_music_disney_classics.pdf
    • https://cdn.shopify.com/s/files/1/0457/3636/2140/files/pupaxugobuzil.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6c190f4b6494997a8f83f845ef1045a.pdf
    • https://static.usrfiles.com/ugd/1decf9_0637313dbdd1495c90ab1a9eca3fea2e.pdf
    • https://static.usrfiles.com/ugd/43d598_c241cc7dbb3f46edbed6af0455e12c9a.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/7810160699.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/13645846097.pdf
    • https://cdn.shopify.com/s/files/1/0431/3438/6332/files/fokum.pdf
    • https://cdn.shopify.com/s/files/1/0452/7525/0849/files/calderas_a_vapor.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/42689101602.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_off000062ca.bin
50418d244baf4af6b69b9954798341fc07a0e17e16f35e84d58fe880c7d7043e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 5152 bytes
font_01_sfnt_off0000743d.bin
463a6eba6644177470fb7b9d275e74481d734f2dbffdf85e5b09e50996e4fd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743D 11484 bytes

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