Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1c3c88c9d3801b…

MALICIOUS

PDF

36.2 KB Created: 2020-08-29 22:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a539d1d5814a10822307d2e0bed4d94 SHA-1: 6dbc52d4469b8b0aa39bde511fb090d5d7d30ebd SHA-256: 3f1c3c88c9d3801b6cb9f6812f07115595c857dd7805916cfda702c715d5b81f
120 Risk Score

Malware Insights

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

The PDF file contains a link to a redirector URL, identified as malicious. The document body, though heavily obfuscated, contains text related to 'chemistry regents questions' and the malicious URL. This suggests a social engineering lure to trick users into clicking the link, likely leading to further malicious content or exploitation. The presence of a link farm heuristic further indicates a deliberate attempt to distribute links.

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/wix?keyword=practice+chemistry+regents+questions+with+answers
    • https://static.usrfiles.com/ugd/be19e1_27da8dc70ec94d6293169adfa3812d41.pdf
    • https://static.usrfiles.com/ugd/33a16d_4eb6b8c00bde4226b54a9664ef746e66.pdf
    • https://static.usrfiles.com/ugd/b8c837_4820d587703c45f1bae3d88223922d31.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/knight_in_rusty_armor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/73353101797.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/jikoxewefofoxex.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1407/files/aiou_date_sheet_ba_spring.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/58835787287.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/53234162041.pdf
    • https://cdn.shopify.com/s/files/1/0440/3127/9269/files/royals_acapella_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0446/3663/5299/files/garmin_nuvi_200.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/michael_t_heath.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0430/8579/1383/files/85049135970.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_off00004de7.bin
706e3600d58e5c7833f354806000c4ca0a2436127ea1df78fae5fab6b17f2859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE7 5504 bytes
font_01_sfnt_off00006084.bin
c56951e52f76e12db42f443c9c113397118aed0ce9d3311522ca1f54dc481546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 10304 bytes

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