Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4703d590144f348…

MALICIOUS

PDF

75.5 KB Created: 2020-09-13 14:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc0d2c99ac24fe5ae2a1d6b721e5199 SHA-1: e4f0826971432b6d9b671329c832263c8399975b SHA-256: a4703d590144f3480c73387812533010d8a5d0fff62131d44d0eca50b307c2f8
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, which is further supported by another critical heuristic indicating a link farm designed to host numerous external PDFs. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by the heuristics. The presence of a 'download button' heuristic suggests a social engineering lure to trick the user into clicking the malicious link.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=obb+apk+file
    • http://files.steelin1.com/uploads/1/3/0/7/130739274/nujutozuwawug_rikoja.pdf
    • http://files.maizewallin.com/uploads/1/3/0/7/130775106/8667528.pdf
    • http://files.crosscountryfarm.net/uploads/1/3/0/7/130739971/4122b56a86.pdf
    • https://static.usrfiles.com/ugd/238140_f83d783132444fd0b5cfe64d70ef424a.pdf
    • https://static.usrfiles.com/ugd/2813e2_9e80ebcc029c446386382848616f8ab6.pdf
    • https://static.usrfiles.com/ugd/50de67_95cc8b3693ef4519b9a4c6a6713eeee7.pdf
    • https://static.usrfiles.com/ugd/762c1a_7e8d0f2e81d54425a7476173153417a8.pdf
    • https://static.usrfiles.com/ugd/e6e573_50ccd0eabb2a429db9d1a5a80c08e0ab.pdf
    • https://static.usrfiles.com/ugd/185811_a4331634c8d444dd9c109b4d640c3c35.pdf
    • https://static.usrfiles.com/ugd/92ee2b_64ac2283459c4c8db641ce21e773562c.pdf
    • https://static.usrfiles.com/ugd/b7ed05_6065036828da4beb8345dd47a533fc84.pdf
    • https://static.usrfiles.com/ugd/595093_51ebf73136cf4a418490e8c80d69e51e.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/5751887735.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/81011741915.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/16295095968.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/cen-_tech_digital_multimeter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/51489514816.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_off0000e694.bin
5489f5fc660025680f67bd21ef69ef97520e35b4a32fd443f407d815529e3005
pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 4852 bytes
font_01_sfnt_off0000f72f.bin
55ab8e8cc9edd0338b4198bfa989f33fb8a38cca95b11182ca1d8e1ecae58722
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 12988 bytes