Malicious PDF — malware analysis report

Static analysis result for SHA-256 884b0bdf9e2c81e4…

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 17:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaf26187edf718fe2423ca7117a4e776 SHA-1: d071ed923d4b0e62c4331e998c31723b65537759 SHA-256: 884b0bdf9e2c81e49909a20593c0688d9497db45480a5f7b0e7ada650e11bea5
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=arabic+alphabet+writing+practice+worksheets+pdf'. This URL is embedded within the document body, disguised as a link to educational worksheets. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, tricking users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=arabic+alphabet+writing+practice+worksheets+pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/appiani_maneuver.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1062/files/vifififunogosugafo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/65591635405.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/chuys_nutritional_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/bankersadda_reasoning_book.pdf
    • https://static.usrfiles.com/ugd/e3ff21_4baa8ba0faf04b3aa8b9f13158002872.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/cabin_crew_interview.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/galolofumubasijifesob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4739/4199/files/ridekusoserukadujamemu.pdf
    • https://static.usrfiles.com/ugd/eaf48f_25f9262e5d5645ac91f2ffe6037f1768.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_01f2364bf5d144c09ba6cd23be95dc9e.pdf
    • https://static.usrfiles.com/ugd/12f4eb_5b2bb8665b0d4b4ba8b3ee39ae6e4d7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.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_off00005955.bin
5cd251ebe0114d4a4f242c167b6f7635a40a362c778ec07e212cc236f093255d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5955 5700 bytes
font_01_sfnt_off00006cbe.bin
00150374b340324c55345afccbc26ec5e06d95c6830f84f3c95193d8ad0c3320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBE 9772 bytes

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