PDF malware analysis — malicious · b7ca06602b3ef810

MALICIOUS

PDF

69.9 KB Created: 2020-09-05 15:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0565b3540525f3cb6d166eeb43028a40 SHA-1: 3abe67dafff1a865e4e6b099f1b7a335ce5edc71 SHA-256: b7ca06602b3ef810d1063d0aa487c7fc4f8a735b20fc6337f9083feb93501231

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=mastering+physics+answers+chapter+20'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to a site offering answers to physics questions, which redirects to malicious infrastructure.

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=mastering+physics+answers+chapter+20
- https://static.usrfiles.com/ugd/3ed902_0ed82b5b7cb04118a0d47056c4e2c98e.pdf
- https://static.usrfiles.com/ugd/902d29_bf145a011da64435b54cfbf457bde2f7.pdf
- https://static.usrfiles.com/ugd/b28ae2_86eaf0cfaebc46afb4ec0260afcaf454.pdf
- https://static.usrfiles.com/ugd/6812d7_360feaf9e14840b4971267fa52536e40.pdf
- https://static.usrfiles.com/ugd/26481d_7e8b55c17d134188a4a007e44371b325.pdf
- https://cdn.shopify.com/s/files/1/0437/3990/6197/files/photo_license_center.pdf
- https://cdn.shopify.com/s/files/1/0430/3729/4745/files/13309240511.pdf
- https://cdn.shopify.com/s/files/1/0459/9057/6285/files/74966279128.pdf
- https://static.usrfiles.com/ugd/bb13a2_09dba2667d3d42608d79f30f1574a17f.pdf
- https://static.usrfiles.com/ugd/3b6424_30ebfb2833c1434f81d1015dd2c26149.pdf
- https://static.usrfiles.com/ugd/3f80ec_73ce4ef8b0f34cea8336800f299afdd2.pdf
- https://static.usrfiles.com/ugd/9c43ec_61d74c8a6a7c4c059c6250fc4ce75630.pdf
- https://static.usrfiles.com/ugd/b8c837_bb182faf500d43258938161b721e2c6e.pdf
- https://cdn.shopify.com/s/files/1/0429/1713/4499/files/83030990813.pdf
- https://cdn.shopify.com/s/files/1/0432/1119/4525/files/lemanuvivexi.pdf
- https://cdn.shopify.com/s/files/1/0434/8972/2534/files/r_for_data_science_cheat_sheet_datacamp.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d31e.bin` `9a07725267f06cac05727e5a8572ebe1234868871f9963c547d4e5fcab3f71bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD31E	5636 bytes
`font_01_sfnt_off0000e674.bin` `e1a7efb84b8039af489530ca0d37b76527b2a52639fc0fc86ccacbf5fc11c601`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE674	10496 bytes

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