PDF malware analysis — malicious · 4f913e9f67b2c579

MALICIOUS

PDF

43.9 KB Created: 2020-08-23 21:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e429cf755b2c6f31d0e3e9a85300d000 SHA-1: 51dfd3b8989dea590b2eabaf9e6eb1bf35b4796c SHA-256: 4f913e9f67b2c579241acdcf3d5cec4a7a77b3bdf25878735270faebb37afda2

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain the same lure text as the redirector URL, suggesting an attempt to disguise malicious activity as a legitimate document. 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.ru/pify?keyword=3d+printing+understanding+additive+manufacturing+pdf
- http://rilag.steadfastleaders.org/uploads/1/3/2/8/132815806/6310961.pdf
- http://xikomisob.soubustafarms.com/uploads/1/3/0/7/130775350/satezunivin-wojavilafino-muperu-bipuwegefaluw.pdf
- http://files.marleyrosereads.com/uploads/1/3/1/4/131407465/koxeripagufaru.pdf
- https://cdn.shopify.com/s/files/1/0431/6951/3632/files/tomojojorum.pdf
- https://cdn.shopify.com/s/files/1/0430/3169/1421/files/lebugazuzase.pdf
- https://cdn.shopify.com/s/files/1/0432/0421/4942/files/sunobiwula.pdf
- https://cdn.shopify.com/s/files/1/0438/1271/6704/files/88419021329.pdf
- https://cdn.shopify.com/s/files/1/0434/6370/4729/files/tiwumaxo.pdf
- https://cdn.shopify.com/s/files/1/0439/9936/3222/files/judonowutaguto.pdf
- https://cdn.shopify.com/s/files/1/0432/2898/7547/files/40636026680.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_off00005ffb.bin` `5a73a65791434505df65d5f43f2f0adb972e3c22eec5fbf23006f33cc66a79b3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FFB	5344 bytes
`font_01_sfnt_off0000720f.bin` `13c098647dfcb51c9d63389de2a1fa7ea1bc1337353b950ff260591c089dc006`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x720F	10140 bytes
`font_02_sfnt_off000094b5.bin` `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x94B5	4324 bytes

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