Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92cabc3726b43c0…

MALICIOUS

PDF

45.7 KB Created: 2020-09-10 03:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16531d91945d56b3559033ed12c54a8 SHA-1: 68ee35a929f8a5a0490992e0f0c4fde7e7cf3a10 SHA-256: a92cabc3726b43c05338ae20d282f7ef64caad60a47ece9315775dfe1770487f
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, which is disguised with a keyword related to diabetic diet guidelines. This suggests a phishing or scam attempt. The PDF also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse for traffic generation or malware distribution. No scripts were extracted, but the presence of a malicious redirector and the link farm technique strongly indicate a 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.club/wix?keyword=easy+diabetic+diet+guidelines
    • https://cdn.shopify.com/s/files/1/0447/5689/3847/files/bowwow_shorty_like_mine.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/sisowefirutomelidegudox.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/bltouch_anet_a8.pdf
    • https://cdn.shopify.com/s/files/1/0464/9854/5822/files/67405933304.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0876/files/sources_of_preformed_vitamin_a_carotenoids.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/11113435333.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0460/3432/1572/files/xufaraf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/jedikafozotit.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/mofemegiwevukifukubaguta.pdf
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/annual_leave_letter_sample_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/semujajiduwowemegur.pdf
    • https://static.usrfiles.com/ugd/834936_2b0bfd78293642859bd02974f1e814c0.pdf
    • https://static.usrfiles.com/ugd/b6aaa0_f4f69f367cc7441d9717f05a64e832a4.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_off00007558.bin
c429b0571ef93f21c51a0cfc317af73df604fa70edcd098c13a7417786c2809d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7558 5212 bytes
font_01_sfnt_off0000872c.bin
64d0231755e24d9b7df149edfbd8ebbc226cadcb6f52cbb525a3603984fbb07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x872C 10284 bytes

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