Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a44f54b4bb9e0e…

MALICIOUS

PDF

51.5 KB Created: 2020-08-19 12:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4805bd5bf6653190c587462a9d772125 SHA-1: 025713c3a5af0122c0564537d08da15e6fa7a59b SHA-256: a4a44f54b4bb9e0e2a149ecbf89117fc01dd816bd93380e9b5458c5ee3914c26
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=precalculus+worksheets+with+answers'. The document body, though heavily obfuscated, contains references to 'precalculus worksheets with answers', suggesting a lure to trick users into clicking the malicious links. The presence of a link farm heuristic further supports the malicious intent of distributing 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/pify?keyword=precalculus+worksheets+with+answers
    • http://jekudal.flyingleadsaddleclub.com/uploads/1/3/1/6/131606419/dojizugato_sinurisinoru_gapisolagowuwa_siferukudobiwo.pdf
    • http://topemije.beaverdamchurchonline.com/uploads/1/3/1/4/131482995/9896291.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/44733013290.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/69029018054.pdf
    • https://cdn.shopify.com/s/files/1/0435/4319/9898/files/express_vpn_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/ge_profile_refrigerator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/baroque_architecture_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5464/5916/files/xekuzotapiru.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/28149051684.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/muvinebifup.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/punimeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/star_wars_the_complete_visual_dictionary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000819a.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 2828 bytes
font_01_sfnt_off00008b94.bin
a84aeaebb1adb1813c3dbb398dc1f900ab0001432f0d592a60c17c967b25eb57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B94 5044 bytes
font_02_sfnt_off00009cba.bin
ef8ba8ad5f8ba0633c163e794a8d04e833b5864cfffc3c0697e0e2b9439ebf95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBA 9932 bytes

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