PDF malware analysis — malicious · a8a63676de3d2076

MALICIOUS

PDF

41.2 KB Created: 2020-09-01 10:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dd6ea21a6133937dd0e4875996b9f9ef SHA-1: ebc2db24ee7b0fcc1c4c36201896c9242281c298 SHA-256: a8a63676de3d20768c92715119a7ed19b4df47722ec429664e026022dfc2d057

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to containing a link to a known redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to static.usrfiles.com. The document body contains garbled text but includes the URL that triggered the redirector heuristic, suggesting a lure related to 'solid waste management pdf in tamil'. No scripts were extracted, and the primary malicious behavior observed is the redirection to a potentially harmful URL.

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.club/wix?keyword=solid+waste+management+pdf+in+tamil
- https://static.usrfiles.com/ugd/934fc3_390d5056979f46388465e08193d9a2bc.pdf
- https://static.usrfiles.com/ugd/c4ccc4_86ae2b6adac3431f907c797213eb9642.pdf
- https://static.usrfiles.com/ugd/b8c837_e1de1c023a5a4ace8c1d74a72eafdd2f.pdf
- https://static.usrfiles.com/ugd/b8c837_0359343dc87846aa8fcf29998e796332.pdf
- https://static.usrfiles.com/ugd/4c76bf_5bab9c6e7fd04963ae43683c2cdd5b1b.pdf
- https://cdn.shopify.com/s/files/1/0427/8494/8380/files/rudunekatopakutu.pdf
- https://cdn.shopify.com/s/files/1/0431/1069/5074/files/bagubunowinanibu.pdf
- https://static.usrfiles.com/ugd/d4da64_de486ec3f63a45a3af1a6a082885cd9e.pdf
- https://static.usrfiles.com/ugd/16a96a_89d63f1ae3034c3bac16bcdacffd916b.pdf
- https://static.usrfiles.com/ugd/0a052f_8a915b02656449008f6dd6b075a0769e.pdf
- https://static.usrfiles.com/ugd/1fbf8b_05919bdd06ff47899632d0262db2cf4b.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_off0000631f.bin` `99cacb59a2220ae42c35bd08d2df14234d1424210539afccfde8771d2860f0f6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x631F	5460 bytes
`font_01_sfnt_off000075b8.bin` `5bce337f3fcf4c2202211bdeb431521ae3d05750c9828800580e9c574f0ec387`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75B8	10136 bytes

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