PDF malware analysis — malicious · efa2078d45dd9b85

MALICIOUS

PDF

61.7 KB Created: 2020-08-20 07:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d58adc843cf09743a8a4d4d9dfe1713b SHA-1: f7e23a6637c081a5d837e0fe21a3b3a1b75300a7 SHA-256: efa2078d45dd9b85dc9227fa0d20d8fd6a5b7242c9460a34182b606dfc606c52

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same text as the URL's keyword parameter, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via a deceptive document.

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.cc/pify?keyword=vertical+adjacent+complementary+supplementary+angles+worksheet
- http://sasuvasur.skopelosworksonpaper.com/uploads/1/3/0/7/130738629/ad93951e27a5.pdf
- https://cdn.shopify.com/s/files/1/0431/2937/2832/files/16475204472.pdf
- https://cdn.shopify.com/s/files/1/0431/7849/2072/files/bufowowe.pdf
- https://cdn.shopify.com/s/files/1/0429/9587/6003/files/giferepigiluze.pdf
- https://cdn.shopify.com/s/files/1/0432/7551/8107/files/40897508235.pdf
- https://cdn.shopify.com/s/files/1/0440/2397/2005/files/lorokuwakagipumarixaxewaj.pdf
- https://cdn.shopify.com/s/files/1/0428/2338/5247/files/42828339585.pdf
- https://cdn.shopify.com/s/files/1/0438/8909/8907/files/73437864195.pdf
- https://cdn.shopify.com/s/files/1/0434/0642/6275/files/kamaweworajujatob.pdf
- https://cdn.shopify.com/s/files/1/0443/5096/3868/files/45062205609.pdf
- https://cdn.shopify.com/s/files/1/0437/5917/3790/files/konaxeraxidaderiga.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_off0000a707.bin` `3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA707	2828 bytes
`font_01_sfnt_off0000b102.bin` `80a8b4c9db070d0b9dc548e3366926b48d12cf8f4e655ffaa9ab7f2284996873`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB102	5788 bytes
`font_02_sfnt_off0000c49c.bin` `2d1f8baf76aff4b79432a83cd8f0a88aa93e23334b1116e51c86f73cbbcd7226`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC49C	9896 bytes

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