PDF malware analysis — malicious · aa34b81cb3fba29a

MALICIOUS

PDF

38.7 KB Created: 2020-07-08 11:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1737c54f9aedf0599dda04e3e2213823 SHA-1: 00297290da8f9de9c8528a30581ac6e102793767 SHA-256: aa34b81cb3fba29a643f303e08431abcdf916df678c60ac14ba8ab90ea9cc7dd

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains numerous embedded links, including a critical redirector link to 'ttraff.ru' and a link farm hosted on 'files.muddyriverhomestead.com'. The document body text, though partially corrupted, suggests a lure related to an 'Employment reference letter pdf'. The presence of a malicious redirector and a link farm indicates an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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/wb?keyword=employment%20reference%20letter%20pdf
- http://files.muddyriverhomestead.com/uploads/1/3/1/3/131379395/pavuvedoje.pdf
- http://files.reading2reading.com/uploads/1/3/0/9/130969555/49253ecafb.pdf
- http://files.jonascain.org/uploads/1/3/2/8/132814239/bijulatolo_tojasozixa.pdf
- http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
- http://files.durgansc.com/uploads/1/3/2/7/132710575/b76e9a4670178f.pdf
- http://files.projecthost.org/uploads/1/3/0/7/130775053/rupexavuf_zutazat_sijuvoburuvitak_xurapuvunavuvu.pdf
- https://geditoka.files.wordpress.com/2020/07/92240902224.pdf
- https://vosafeviba.files.wordpress.com/2020/06/29804869833.pdf
- https://sidokijok.files.wordpress.com/2020/07/fewagupeperisoravifir.pdf
- https://fijurabowo.files.wordpress.com/2020/06/zidokizolaf.pdf
- https://kesasite.files.wordpress.com/2020/07/dimubelufajogunidipadiri.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_off00005bb6.bin` `a52c252c83903bcccb5958fe55e8e498fba4108f7e139fc928e4587699d5f433`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BB6	4712 bytes
`font_01_sfnt_off00006ba3.bin` `da535bc74c4a4d5c0708a79fc5b8d1ed7dc5c7b8ff8362c9968d53279bef0f1f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BA3	10200 bytes

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