PDF malware analysis — malicious · b1aa8b17a609ad2d

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 14:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f8f39918c7c2a8c99c756689227cd1c2 SHA-1: 3135c3b59a6a93a9289d69c665d5ad03c1b8dd36 SHA-256: b1aa8b17a609ad2dbd8f3bdb74972b5c8c4a9811700f815ea82e9292bd849044

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting a phishing or redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.ru/wix?keyword=channel+direct+5+workbook+answers+pdf
- https://static.usrfiles.com/ugd/97368a_5c13b50287894bc899e603b16e342826.pdf
- https://static.usrfiles.com/ugd/2e16aa_2ff30d6e111543848cef1daedbacf521.pdf
- https://static.usrfiles.com/ugd/47b1e8_eb7d7f4e031d492fb00e90aca44becb5.pdf
- https://cdn.shopify.com/s/files/1/0435/8068/6495/files/canon_mg2520_printer_driver.pdf
- https://cdn.shopify.com/s/files/1/0436/0473/8206/files/rojutoxezusarisetu.pdf
- https://cdn.shopify.com/s/files/1/0430/7720/6178/files/xalozojaxevelavusobemepe.pdf
- https://cdn.shopify.com/s/files/1/0436/4192/9886/files/jade_empire_walkthrough.pdf
- https://static.usrfiles.com/ugd/b8c837_13cec9d0f67f43a7acac605aaaaa5d1e.pdf
- https://static.usrfiles.com/ugd/ace02d_8d6d022b49dc405c8ad57944984e3698.pdf
- https://static.usrfiles.com/ugd/b8c837_32e944a9cd284f5484f903f3120579ba.pdf
- https://static.usrfiles.com/ugd/7c30af_644ffca3230d456991ee16ac664ff176.pdf
- https://static.usrfiles.com/ugd/1fbf8b_c1fadb7fe59e45e8838363363d07e976.pdf
- https://static.usrfiles.com/ugd/8d0191_dca7f7621b9c4c458d14887571212276.pdf
- https://static.usrfiles.com/ugd/b8c837_265a730817ca492ea2ea61f626ffaf0f.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_off00006883.bin` `781bedb083d8706c4e43c7f53e9af6c6d79bed1408b2c9cb5e0e62c6b05c137a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6883	5568 bytes
`font_01_sfnt_off00007b76.bin` `24b539503c75cfe5e834515b0e3138a7790b9234b193bb51b74d3f4257c324a6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7B76	9588 bytes

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