Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8cff968003d2f2…

MALICIOUS

PDF

33.5 KB Created: 2020-08-31 01:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe1facaba77c736920a07bbda850610f SHA-1: 56b7f1c25c8a68ebe934a7dcacf57d013eacb64c SHA-256: 8b8cff968003d2f2b9aa3eeed5387640a1596880b74fa6705a42b15e6cc04472
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and numerous other links hosted on 'static.usrfiles.com', suggesting a link farm or redirection scheme. The primary malicious URL is used to lure users under the guise of a book download, likely leading to further malicious content or exploitation.

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.com/wix?keyword=chaganti+koteswara+rao+books+pdf+fre
    • https://static.usrfiles.com/ugd/c162b3_411966fb30af42c6bf6efb597233e949.pdf
    • https://static.usrfiles.com/ugd/b8c837_b47c0721ac234d118d943dcd9daec2fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d480769a35384017974c1bb12043c8d9.pdf
    • https://static.usrfiles.com/ugd/f09a9d_38ad9201f60c4cbaa25affaf12031b38.pdf
    • https://static.usrfiles.com/ugd/b8c837_71f729a6cd084929a663a34438542b81.pdf
    • https://static.usrfiles.com/ugd/105a8c_3daab24939da401fa8616613b47dae73.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_56ebec7dea294a3f9e164b3ad0e235a9.pdf
    • https://static.usrfiles.com/ugd/eed56f_597c8783e28b45f68e82f270dc57cc40.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_2db32ebf32b54bfa9981f56a006bdc2f.pdf
    • https://static.usrfiles.com/ugd/e23fbb_6d7357cf026f4ebd86350fd9835d05aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_c75db886b81846b0883d07e6a5c0cedd.pdf
    • https://static.usrfiles.com/ugd/173616_59e2592e8e1b4e1e83dbab034ce6ff86.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/9527988354.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/temporal_arteriovenous_malformation_icd_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8847/files/challa_punjabi_new_song.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/android_tv_box_2019_review.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/nipuzexule.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_off00004638.bin
b6a05a0b3c670a22b4ba7d28e29f9694479b4fba4aa0466d53c05c06d05c5ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4638 5472 bytes
font_01_sfnt_off000058db.bin
cb0f469e708b012910c406d2bce4eea2e0e49cdc61627daf614aa0a33be92cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DB 9416 bytes

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