PDF malware analysis — malicious · 86d2b1cbdd05f2a1

MALICIOUS

PDF

45.9 KB Created: 2020-09-02 15:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 01eb3c8d7741b61b909d6e4ef3ff4542 SHA-1: 0819fd9bb5a026ea2847287e298e6db473cf913c SHA-256: 86d2b1cbdd05f2a150aa82c4d7dda1c6858f37243a90566a1291aa9682dae6d6

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, specifically pointing to 'https://ttraff.club/wix?keyword=factor+polynomials+worksheet+pdf'. This URL is presented within the document body, disguised as a worksheet title. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, luring the user to a malicious site under the guise of educational 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/wix?keyword=factor+polynomials+worksheet+pdf
- https://static.usrfiles.com/ugd/b8c837_41b445d729604eb491da607c374981f2.pdf
- https://static.usrfiles.com/ugd/89602e_4437ecf38cb4486aa344ab5c7c8167e0.pdf
- https://static.usrfiles.com/ugd/6290de_b674d72a9c844072a9d9de271c79ccc6.pdf
- https://static.usrfiles.com/ugd/94e5ef_96fc398ca52249bcbd9719ecb307a68a.pdf
- https://static.usrfiles.com/ugd/865d50_429e5413f94f4f248adf508112f0fa3a.pdf
- https://cdn.shopify.com/s/files/1/0435/3890/7288/files/xisos.pdf
- https://cdn.shopify.com/s/files/1/0440/9052/3813/files/wedes.pdf
- https://cdn.shopify.com/s/files/1/0430/6806/3895/files/60587009843.pdf
- https://cdn.shopify.com/s/files/1/0431/7147/9713/files/adobe_camera_raw_converter.pdf
- https://cdn.shopify.com/s/files/1/0435/3431/9776/files/watazepaza.pdf
- https://cdn.shopify.com/s/files/1/0428/1883/0503/files/tikez.pdf
- https://cdn.shopify.com/s/files/1/0431/2340/9057/files/78407519377.pdf
- https://static.usrfiles.com/ugd/4c3ae3_28de737cd2fa4f169c69349dec3c1a72.pdf
- https://static.usrfiles.com/ugd/3b0c81_e5f1b6614c9a4269bb009679f8e159da.pdf
- https://static.usrfiles.com/ugd/30e015_f3525cf9a0a84772becacc6a342d57e5.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_off0000671d.bin` `6fa631a57dc457c78475bacb9ef2ea412f73984ef318da8fb014a53d7a4dfa2a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x671D	5396 bytes
`font_01_sfnt_off0000795e.bin` `fba38de618ca1a9f8c300a55916216bef6ab536bf76c13414128806f8cc65b6f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x795E	10428 bytes
`font_02_sfnt_off00009cd3.bin` `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CD3	4324 bytes

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