PDF malware analysis — malicious · 2fa183d14b459e32

MALICIOUS

PDF

50.3 KB Created: 2020-08-31 06:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bdb4ed37748fe438056318c24a1c2ac3 SHA-1: 86a1293d7e5a4bc9204be2406f93cbb64311dece SHA-256: 2fa183d14b459e32d30282a661e736c21643b1da054328849d712cbabaec657a

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a chess strategy PDF. This URL is likely used to direct users to a malicious site or download further malware. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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=lessons+in+chess+strategy+pdf
- https://static.usrfiles.com/ugd/b8c837_85610b545a39410487a610b3e7dfc8c2.pdf
- https://static.usrfiles.com/ugd/7ff653_cda43f46780047d6b7fc40c4cf6e654a.pdf
- https://static.usrfiles.com/ugd/bdeb4c_a03a7e1f3a3f4eac8464da0dfb6bdce5.pdf
- https://static.usrfiles.com/ugd/9dda13_6732d36b977a4891b4356304137b5b4b.pdf
- https://static.usrfiles.com/ugd/b8c837_215ee62a3a1148b38f0730dcae6314dc.pdf
- https://static.usrfiles.com/ugd/b8c837_98c42a7bebad40b3bb10e7c6e3deba65.pdf
- https://static.usrfiles.com/ugd/384ea4_4275aed87b3741f78fa8228455b02c57.pdf
- https://static.usrfiles.com/ugd/b8c837_a4c6d90b75eb48389884835676fbe3f3.pdf
- https://static.usrfiles.com/ugd/696b8a_420a4e67bd934407b7279f3acbf0ee72.pdf
- https://cdn.shopify.com/s/files/1/0434/2985/5393/files/testing_acids_and_alkalis_worksheet.pdf
- https://cdn.shopify.com/s/files/1/0428/6670/4550/files/garamopofi.pdf
- https://cdn.shopify.com/s/files/1/0427/4677/3660/files/taste_of_ink_lyrics.pdf
- https://static.usrfiles.com/ugd/b8c837_0e2a18021ca2478e90e3c76a36a9604d.pdf
- https://static.usrfiles.com/ugd/b8c837_32af411ec13b4b5586ca4b5e2a8b5380.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000079f6.bin` `31038f58ecba5892ebba987b2dfb2f89b80a28351345c054705cd9fe89e207ae`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79F6	5216 bytes
`font_01_sfnt_off00008bb5.bin` `d104fe80fb9247757ade6c4a110be07e360107e992026f2db89d972d7588511b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BB5	10348 bytes
`font_02_sfnt_off0000aeab.bin` `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAEAB	4324 bytes

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