PDF malware analysis — malicious · 88d036aad8b49e15

MALICIOUS

PDF

34.4 KB Created: 2020-09-01 08:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 139cd21731daf5a33ddf85f6a8ff5ea8 SHA-1: 8fb01e9c5a5489411f7c312cc9ee22291c177151 SHA-256: 88d036aad8b49e15b3961cf13f37a7f968e4141583bd8768c1ee96dcf81a8acd

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to fonts and includes the malicious URL. This suggests the document is designed to trick users into clicking the link, likely to download malware or be phished. No scripts were extracted, but the PDF structure and embedded links are sufficient for this assessment.

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=bangla+typography+font+free
- https://static.usrfiles.com/ugd/704566_7490face56fb473daa23912d31f115a4.pdf
- https://static.usrfiles.com/ugd/07e02c_84d97e5709d1428eb736fd29a7d246e9.pdf
- https://static.usrfiles.com/ugd/f515ca_7a2f931c6c3d47729933433770e3aaf7.pdf
- https://static.usrfiles.com/ugd/5b5da7_50eaea28806b4340b7f07ed06423aaa2.pdf
- https://static.usrfiles.com/ugd/e2c250_b8e2e87a0ceb427ca2e6a87ffe7fe341.pdf
- https://static.usrfiles.com/ugd/b77b08_c9f93cebec2b4913b563d18527fbc40c.pdf
- https://static.usrfiles.com/ugd/8acad3_67e763f74cb44550be475350afbaff02.pdf
- https://cdn.shopify.com/s/files/1/0433/3725/3023/files/96778612354.pdf
- https://cdn.shopify.com/s/files/1/0431/6086/2874/files/cambridge_checkpoint_english_past_papers_2020.pdf
- https://cdn.shopify.com/s/files/1/0437/5465/1799/files/65550914088.pdf
- https://cdn.shopify.com/s/files/1/0431/6784/2459/files/kefutarukepew.pdf
- https://cdn.shopify.com/s/files/1/0434/1553/5774/files/94619094174.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_off00004a9f.bin` `8016a866ea03c1ba0a8935b8a2735c847e6964b6a45151aede329bfbe3869a1c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4A9F	5136 bytes
`font_01_sfnt_off00005c21.bin` `31c224533f91454d1987020c254c466ed79d25f0337e4004c8619212482e6f88`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C21	9644 bytes

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