PDF malware analysis — malicious · a5a2279396d16c7a

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 03:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1f0b61801fb7fb4b14115198703f3d20 SHA-1: 4066a877d4df2da3c60d88f5799e1772cf905047 SHA-256: a5a2279396d16c7afd0d1197ea135a85a995ae1581771e381ce75a877bab738e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector. The presence of a link farm and the ML classifier firing further support malicious intent. The primary attack vector appears to be tricking the user into clicking the malicious link.

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=best+circle+of+fifths+app+android
- https://static.usrfiles.com/ugd/8b49c6_776e6a36893441768b60a2148193bd6f.pdf
- https://static.usrfiles.com/ugd/8127dd_452daf18e9a541a18f3772ead1508248.pdf
- https://static.usrfiles.com/ugd/921909_83acccc449d049118402211215bc7127.pdf
- https://cdn.shopify.com/s/files/1/0439/2353/8088/files/92544718064.pdf
- https://cdn.shopify.com/s/files/1/0428/2921/7958/files/aye_nsare_3_yoruba_movie.pdf
- https://cdn.shopify.com/s/files/1/0431/5214/6586/files/borim.pdf
- https://static.usrfiles.com/ugd/d7ba0f_0164c9f923c84172923d2748a4dc7ffc.pdf
- https://static.usrfiles.com/ugd/3aee12_163125df780b42c1b1b034dc81eac2f2.pdf
- https://static.usrfiles.com/ugd/33a2e4_e0583a68dd7f4ddf98c4bb6ccd509e7e.pdf
- https://static.usrfiles.com/ugd/4d935e_7217ab3bf88a4900a211271155d0ecdf.pdf
- https://static.usrfiles.com/ugd/9e53d4_e905d0cd0ca74d2784285635310a2f73.pdf
- https://static.usrfiles.com/ugd/b8c837_e7ff5c28a83c46d7be195f2ff233c73b.pdf
- https://static.usrfiles.com/ugd/b8c837_5706dc71ac81497597232a735f013d13.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_off00006788.bin` `60a0d86444af4c95f0cdd194eb44d1a31b1cac746b9938d2f6bd34e83be0428c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6788	5292 bytes
`font_01_sfnt_off00007985.bin` `d1ca0c8109a90158a2a4773151f7d1d3b0602dc7a95fd6db3fa51e61e1bff51c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7985	10092 bytes

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