PDF malware analysis — malicious · 5a0109cc9edbd637

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 06:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 12754a09c1d2bf1dfb60d02d14b1142f SHA-1: 802961591f2349bd5694c4dee791b79b901a3a38 SHA-256: 5a0109cc9edbd637c0fa5e6ca2a8e8188406ffeaed6f9200666f441791973ac1

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=belencito+mixco+tulsa, which is flagged as malicious. The presence of numerous links, including to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=belencito+mixco+tulsa
- https://static.usrfiles.com/ugd/b8c837_9598cd4bcc004f8ebc6a8e483cf660ae.pdf
- https://static.usrfiles.com/ugd/b8c837_03a38d3ee55f42c0881c854eeebf817f.pdf
- https://static.usrfiles.com/ugd/b8c837_c720883fa70a4b16aa28daeb13e60fa9.pdf
- https://cdn.shopify.com/s/files/1/0431/0011/0999/files/wojajonugugowurelu.pdf
- https://static.usrfiles.com/ugd/b8c837_42a66ad919d34360ae6ce3c67c1ee1a9.pdf
- https://static.usrfiles.com/ugd/b8c837_b321b21320a64d7cbcbbbf065576e80b.pdf
- https://static.usrfiles.com/ugd/b8c837_0b8f1a4400a3422b8909dc1a4f0ee5ce.pdf
- https://static.usrfiles.com/ugd/b8c837_6718665c2c244bb0a2cd4bbcf9101354.pdf
- https://static.usrfiles.com/ugd/b8c837_a45926fb051d41e8aacf8757528a5a29.pdf
- https://static.usrfiles.com/ugd/b8c837_982ba3c290874ee3ae1fe6249606b348.pdf
- https://static.usrfiles.com/ugd/b8c837_97f85b41274d472883a1862f60b0a4f1.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_off0000441d.bin` `e88edd370a29aeded962aaeabdca7fbb3a769da0575cf871260754a87215a52f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x441D	4848 bytes
`font_01_sfnt_off00005477.bin` `77756b91de400fea2920022f3d2e0e77fc316fdd8c8d01b88d6d2c170dfbdac2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5477	9688 bytes
`font_02_sfnt_off000075b6.bin` `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75B6	4324 bytes

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