Malicious PDF — malware analysis report

Static analysis result for SHA-256 55decfe2f7d6c5ea…

MALICIOUS

PDF

51.0 KB Created: 2020-09-05 22:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f7a1477ee3676abbabc4d1ce83f091 SHA-1: 534446e6964a78a98c271b34c26ffc4e07268152 SHA-256: 55decfe2f7d6c5eade8e6e12aa3cc3b114f49dd8e3ebdf88f2d59dff88115e26
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, disguised as an exam date sheet. This redirector is likely used to lead the user to a malicious site or download further malware. The PDF also contains a large number of links to external PDFs, many hosted on Shopify, which is characteristic of SEO link farm abuse to improve search engine ranking for malicious content.

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.club/pify?keyword=icai+nov+19+exam+date+sheet
    • https://cdn.shopify.com/s/files/1/0438/7006/0704/files/advantages_and_disadvantages_of_mobile_phone_cloning.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/zadimomasakudixojike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/fikesofufigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/88979731846.pdf
    • https://cdn.shopify.com/s/files/1/0434/1068/6113/files/doodle_god_cheats_artifacts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://static.usrfiles.com/ugd/735424_d710249389c24e73b42660720b872dcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d963c41c3254c718a19e9826dba365e.pdf
    • https://static.usrfiles.com/ugd/db1da1_de7db16826604e97b89dd87da2491eaa.pdf
    • https://static.usrfiles.com/ugd/16879a_9de77d413b154d6bbe57dafea3a9f342.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6509/files/4965224573.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/19573533824.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/99731584993.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_off00006986.bin
5b3d0d5c7c48858067dfa6457b1bb4c18f3f06bdf64a82c714b06ef941d7a9f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6986 5324 bytes
font_01_sfnt_off00007b90.bin
298299393a29096c3b3b06c633f8b83793833ee66586964b4ab5c4a1065f8368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B90 14856 bytes
font_02_sfnt_off0000a9ee.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EE 16164 bytes

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