PDF malware analysis — malicious · 4094bf9a93b638d3

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 05:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c898a94852050bc17a690936b60ccbfa SHA-1: cd60bfc893fc86c5fccbf8188046f12354694968 SHA-256: 4094bf9a93b638d38fba6f110ed1087856c6ccbbb6b7cf1cb2bd63c57a6767ee

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is designed to lure users to malicious content through a chain of redirects. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was heavily obfuscated.

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=harry+potter+platform+9+3%252F+4
- http://files.affordablestoragesanangelo.com/uploads/1/3/0/7/130775958/456a51bf2939.pdf
- https://cdn.shopify.com/s/files/1/0427/9664/6556/files/66244985323.pdf
- https://cdn.shopify.com/s/files/1/0428/1883/0492/files/8975588219.pdf
- https://cdn.shopify.com/s/files/1/0430/4273/4229/files/72330214522.pdf
- https://cdn.shopify.com/s/files/1/0434/4286/4289/files/pozun.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
- https://cdn.shopify.com/s/files/1/0429/5078/7231/files/74145046362.pdf
- https://cdn.shopify.com/s/files/1/0433/4164/3928/files/wanamigogagudetafisi.pdf
- https://cdn.shopify.com/s/files/1/0440/5493/7765/files/bakowajovugemotevanib.pdf
- https://cdn.shopify.com/s/files/1/0429/5504/7068/files/t_spin_tetris.pdf
- https://cdn.shopify.com/s/files/1/0430/2834/9079/files/pepefovubitakaxazasad.pdf
- https://cdn.shopify.com/s/files/1/0438/8506/8456/files/wepidejajetodaru.pdf
- https://cdn.shopify.com/s/files/1/0439/5122/7048/files/mizej.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_off0000637b.bin` `87327080b4570501e698a44c091a72643622cd85cc87e6f3582d66d4b0fd4ed6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x637B	5376 bytes
`font_01_sfnt_off000075c6.bin` `01def1914dd8b1b722cf984ad61d2f5a0246c29b83198877b3e4063c79ffce35`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75C6	11232 bytes

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