Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7acd95b2902d42c…

MALICIOUS

PDF

53.9 KB Created: 2020-09-06 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a24eaad4ba934a77cb45fb90e657fd SHA-1: 56f9a9b7690a770c6ce18666d1bf7358b431ff32 SHA-256: b7acd95b2902d42cf19960e548b72ca63ed0ac25e17d6c6810b31e3dc54d4cc9
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/pify?keyword=sample+appraisal+report+for+teachers'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/7e0eb0_98ff07ab2c154d21b9d11d4f9a7e3af8.pdf' being the first identified. The document body, though heavily obfuscated, contains text suggesting it is a 'sample appraisal report for teachers', likely a lure to entice users to click the malicious link.

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.link/pify?keyword=sample+appraisal+report+for+teachers
    • https://static.usrfiles.com/ugd/7e0eb0_98ff07ab2c154d21b9d11d4f9a7e3af8.pdf
    • https://static.usrfiles.com/ugd/d32f78_0b9e1fbf0d814df38837528d3f87f7fd.pdf
    • https://static.usrfiles.com/ugd/a01749_ee39c6d000a143d39cebb95e94e32733.pdf
    • https://static.usrfiles.com/ugd/f523c3_4567db102a954d31b7a59725f3b76dc5.pdf
    • https://static.usrfiles.com/ugd/b0c717_59f0a757aa174796918fab1e53003816.pdf
    • https://cdn.shopify.com/s/files/1/0447/1685/1356/files/believer_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/contrarian_investing.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/baal_veer_episode_1102_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/my_benny_card.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/19095104814.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6920/files/simple_budget_template_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/zekibalilosaz.pdf
    • https://static.usrfiles.com/ugd/234f58_0d4b1e80315d4deaa1d4d3a758487363.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d344323bb46cabc741122bd7c87af.pdf
    • https://static.usrfiles.com/ugd/e3325f_e733e60092274f97b4ea574089e0566e.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_off0000953f.bin
d2c8ee22d3f5567d331352bc5db7530e3b9a0d02f165213965d7bf4eef9a9d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953F 5356 bytes
font_01_sfnt_off0000a747.bin
0578fc291115d86e0918e7d69abe8bbd4210ec0eaa6b20eb12bf441474d6f16c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA747 10272 bytes

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