Malicious PDF — malware analysis report

Static analysis result for SHA-256 338b9931df937490…

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 01:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a08725db37f17bb004870c3a7c01e9fd SHA-1: c936bd519e712474e6df830c1d3bb22fc35a4614 SHA-256: 338b9931df937490236aa22ed4acd5268f6c70b74efd1a591be6f511536bba84
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=android+phone+games+free'. This URL is presented as a lure for free Android games, suggesting a phishing or social engineering attack. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and the social engineering lure indicate a high likelihood of malicious intent.

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=android+phone+games+free
    • https://static.usrfiles.com/ugd/ea5d7b_95472d04d74c4cf0bb000ef005e6550e.pdf
    • https://static.usrfiles.com/ugd/e3834b_48a7162239e44b06861a5bc336c865c9.pdf
    • https://static.usrfiles.com/ugd/b50c55_1495638159594497bc737d624f5016c8.pdf
    • https://static.usrfiles.com/ugd/de60da_90dbd09bec544cb5b3304c62995139e6.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/nurak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/suburban_rv_water_heater_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9467/8435/files/44844843453.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/46239130976.pdf
    • https://cdn.shopify.com/s/files/1/0432/0991/6576/files/artificial_neural_network_abstract.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5380/files/gadgil_report_kerala_in_malayalam.pdf
    • https://static.usrfiles.com/ugd/0bcf16_4513a381fadb43fcb86e14bddac2dd5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_354a95618d324d27ae6063bcd34cfe0b.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_off000067f8.bin
651fcf1629d170cebc3c82f5d81ee2f2b7be0f6817c8dd6e30e29519c4c1ae5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F8 5120 bytes
font_01_sfnt_off00007927.bin
c6e5fc42995dee57e336373a22e35558499c621c6afd20e4bc7db054e0c92c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 10260 bytes
font_02_sfnt_off00009c53.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C53 4324 bytes

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