PDF malware analysis — malicious · b538903517cb147c

MALICIOUS

PDF

39.8 KB Created: 2020-08-31 10:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fc3a93146dc783e93d6759fe78b1d1c4 SHA-1: def2fc86ec94286d0fc120f2e40109d7145dad64 SHA-256: b538903517cb147cd0dd58aafb76de673eba3f3bfac3387d4e221847cd6266a3

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains a significant number of embedded links, many of which point to a redirector. The document body contains a URL that appears to be part of a link farm or SEO poisoning attempt, likely intended to lure users to malicious content. No scripts were extracted from this sample.

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=google+sites+rotate+image
- https://static.usrfiles.com/ugd/79e0dc_12986ecdc9ef438cae06806890b66959.pdf
- https://static.usrfiles.com/ugd/9dda13_52432cba52e646728fc63bfb7893daf6.pdf
- https://static.usrfiles.com/ugd/432b07_b36caa81e20f4b98beb859267ac7c182.pdf
- https://cdn.shopify.com/s/files/1/0432/9704/6681/files/89095113798.pdf
- https://cdn.shopify.com/s/files/1/0427/7505/2454/files/lutipubogotesaze.pdf
- https://cdn.shopify.com/s/files/1/0438/9509/5464/files/pearson_biology_class_10.pdf
- https://cdn.shopify.com/s/files/1/0433/1097/3083/files/fivezazowuga.pdf
- https://cdn.shopify.com/s/files/1/0431/2875/0241/files/27777299736.pdf
- https://static.usrfiles.com/ugd/db93e9_44af3e4306714d508e48d8cd2d98f94d.pdf
- https://static.usrfiles.com/ugd/b8c837_348a381b90e04564b8edfbc84f6041ee.pdf
- https://cdn.shopify.com/s/files/1/0432/5464/4894/files/42150441728.pdf
- https://cdn.shopify.com/s/files/1/0429/9934/9407/files/annabel_lee_poe.pdf
- https://cdn.shopify.com/s/files/1/0431/7508/4193/files/92603744945.pdf
- https://cdn.shopify.com/s/files/1/0440/6339/1894/files/54876261518.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_off00005e71.bin` `da3b20660cd14c33828bec4ca5bba4c50492aa4d203b26c2f76c66eaaa58f317`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E71	5036 bytes
`font_01_sfnt_off00006f7f.bin` `572967da0317076b264e297ad403511a1f0f7bde3225ce0e997094c4eeeeaca2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F7F	10256 bytes

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