PDF malware analysis — malicious · a65722ecf1f66bd6

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 05:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0fa0e9cc85fbf11907df4525885d1609 SHA-1: 33703212a9421f52599fbe12b421cc024e759472 SHA-256: a65722ecf1f66bd63b8aeea0c11dda12189c260f33008d7068a9f6bd184481a6

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at ttraff.me, which is likely the primary payload delivery mechanism. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing its role as a lure for users searching for software. No scripts were extracted from this sample.

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.me/wix?keyword=bluestacks+2++for+windows+7+pc
- https://static.usrfiles.com/ugd/12dc78_19b89bd137f543f08d106a0acb729bd1.pdf
- https://static.usrfiles.com/ugd/de60da_189516d9d0f94fa09b26b45ae92b434a.pdf
- https://static.usrfiles.com/ugd/fd3290_448b0777e7534034b7292d53c127e827.pdf
- https://static.usrfiles.com/ugd/9ea91e_b18a09f8626d46f8a95d11e6301b1deb.pdf
- https://static.usrfiles.com/ugd/b8c837_184b8fb892aa49e5bf07b8003eeaf816.pdf
- https://static.usrfiles.com/ugd/a48928_531450e51bbd4bddb7bf8deabfc40bc8.pdf
- https://static.usrfiles.com/ugd/df4650_da7bae4f1fe54d24ba473cf0a666c18e.pdf
- https://static.usrfiles.com/ugd/e745be_d1e52ac386f1457dac0affae0d4af284.pdf
- https://static.usrfiles.com/ugd/b8c837_729d092be7254e4cacead38842b70740.pdf
- https://static.usrfiles.com/ugd/f80014_70d0f13fe9e54d92a4fbc17f748f1057.pdf
- https://static.usrfiles.com/ugd/ef7b09_e71c78b2b80d4ac591a3f073e416d726.pdf
- https://static.usrfiles.com/ugd/430cb2_d3ce8e436e2246e1a330e99d4598ff00.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_off00007434.bin` `53a373900e651efc05b5575ac25c0e66ba5a45ec371ef7fa1eaaf0a9ebcbbbb4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7434	5568 bytes
`font_01_sfnt_off00008758.bin` `e4423d7ee52044596d891692552ea6db0e54d5f460aa905083134c36a10dfd62`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8758	10772 bytes

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