PDF malware analysis — malicious · fdbede0390866273

MALICIOUS

PDF

78.8 KB Created: 2020-09-06 11:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 136e91cc929a34874a8238bc56ee5801 SHA-1: 631fc710d8ee1cfcc11fe27b5d61236688cf99e4 SHA-256: fdbede03908662733ec283caf16afb90677d18ef61735e4dd448e3aea6ad18b0

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/pify?keyword=nof+osteoporosis+guidelines+pdf', which is likely the primary lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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.club/pify?keyword=nof+osteoporosis+guidelines+pdf
- https://cdn.shopify.com/s/files/1/0428/7247/1718/files/51395057808.pdf
- https://cdn.shopify.com/s/files/1/0427/9359/9132/files/55441294930.pdf
- https://cdn.shopify.com/s/files/1/0433/5173/6471/files/50250554461.pdf
- https://cdn.shopify.com/s/files/1/0439/9667/6254/files/awake_fiberoptic_intubation.pdf
- https://static.usrfiles.com/ugd/a2e20a_2184a36b131a48a1b2c76c6f49a4f60b.pdf
- https://static.usrfiles.com/ugd/4d935e_5919ea31a8254656a942a05a878d8efe.pdf
- https://static.usrfiles.com/ugd/964009_4be1e8880cc34e548b8ba42b36df0710.pdf
- https://cdn.shopify.com/s/files/1/0430/0334/7098/files/lyric_route_66.pdf
- https://cdn.shopify.com/s/files/1/0433/3705/6414/files/tumuwofojukofabef.pdf
- https://cdn.shopify.com/s/files/1/0429/1877/2903/files/1212349425.pdf
- https://cdn.shopify.com/s/files/1/0445/7899/6383/files/biodegradable_food_packaging_materials.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_off0000ef31.bin` `276edf3e9ea7c5a5a93c49d556e3d875c1ab27b5907f8b52e1cfb59474bd66ac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF31	4968 bytes
`font_01_sfnt_off00010034.bin` `8d7bf07bc9a9fef251d6c9fc4748b560abcf16968b50f9948f8a381f5366ef0f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10034	14732 bytes

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