PDF malware analysis — malicious · b4a5d40ee16ad63a

MALICIOUS

PDF

41.0 KB Created: 2020-09-02 01:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 29a85000f2c16ae6ba7cef6f53ecfa4f SHA-1: 3e0404abdcf839a6f52d0b4980882a681a65c21b SHA-256: b4a5d40ee16ad63a632476d8f1e017922bc5cc869806d7b6929f2d4a1447f701

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic indicating it contains a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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=fmla+guidelines+pa
- https://cdn.shopify.com/s/files/1/0431/4615/0039/files/94640442552.pdf
- https://cdn.shopify.com/s/files/1/0431/7052/9436/files/2501078815.pdf
- https://cdn.shopify.com/s/files/1/0430/5698/8317/files/dosarat.pdf
- https://cdn.shopify.com/s/files/1/0436/6044/3813/files/open_3_lith_void_relics.pdf
- https://cdn.shopify.com/s/files/1/0465/0870/3894/files/old_shayari_video_status.pdf
- https://static.usrfiles.com/ugd/f34823_d6fb043b002049079835e387cb5a63a4.pdf
- https://static.usrfiles.com/ugd/c75f60_db1bbaaaacc244c9b72ea1359c69ba0a.pdf
- https://static.usrfiles.com/ugd/ac72e0_7373f5dc77264676812fcd05096167e0.pdf
- https://static.usrfiles.com/ugd/4f92c1_07168109299847eb8cc4eb1d5a23f103.pdf
- https://static.usrfiles.com/ugd/dd4472_1bf18716a47f4af19b006edf5c8042a5.pdf
- https://static.usrfiles.com/ugd/cac9e4_cc8cf4c0f4dd4501bcd5e92187b01ef7.pdf
- https://static.usrfiles.com/ugd/930050_7f095a3fa230496487e703f66fce29fe.pdf
- https://static.usrfiles.com/ugd/0b46e6_238bd2c094c24065aa2df3b1d47027a2.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_off000062ad.bin` `dfedd00a5c78cdf65380b9f514b7a8d7ffccb6f0b8fa41c7d0e306df77d9bf1a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62AD	5136 bytes
`font_01_sfnt_off00007419.bin` `f4d87c42dd5a4abaa652ed954b5db70d1fa840a31ba775d2c39edd99d51e2bcf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7419	10320 bytes

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