Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eee48a5b306a50…

MALICIOUS

PDF

41.6 KB Created: 2020-09-01 01:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010eb12c6f454344d2fd9f010532ab73 SHA-1: aa6ec96ba7c76575f94ef6a215b71641216c49d2 SHA-256: a8eee48a5b306a50724ecff026427f17a94392dbc345a170fc44fe7321c623ed
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=year+3+maths+problems+worksheets'. This URL is presented within the document body, disguised as educational material. The PDF also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious.

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=year+3+maths+problems+worksheets
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/48954572594.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/28478571032.pdf
    • https://static.usrfiles.com/ugd/b4a829_166764552b5245cb822456125ec2b196.pdf
    • https://static.usrfiles.com/ugd/9b33c5_b9203a0b1337407492d65472d3b60af5.pdf
    • https://static.usrfiles.com/ugd/30e015_f2d98368125a4e32a1100744edb3faf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e60d38d172564e7582d1c6a0d27d4e02.pdf
    • https://static.usrfiles.com/ugd/e5a943_b67b15209f814d9b81225e4c994af6aa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/the_promised_neverland_isabella_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9072/files/ikea_ps_cabinet_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0461/9436/0483/files/wikegiduxili.pdf
    • https://cdn.shopify.com/s/files/1/0458/0471/6198/files/biviziwagekutek.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/gasapotedaxuwil.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/20847978247.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_off00006369.bin
6e7307734cb0ef64db8d68598c60f1434e00a870a64bb46ec42ecf37025e5149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6369 5480 bytes
font_01_sfnt_off000075ef.bin
d037855db7f98a07c7f5b80276095b3973219774f3b5f8bd5f73b7af053418fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 10376 bytes

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