PDF malware analysis — malicious · cbe106abb94d0f9c

MALICIOUS

PDF

42.0 KB Created: 2020-08-26 08:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c87694b1d5e3e1da4b42b6e25d545324 SHA-1: b945ad3a051986d4aac147f54610a5c7c167f29c SHA-256: cbe106abb94d0f9c67ea22cf0bae47c579f98f9d8ea04f8645ff950a364a28c0

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains the same redirector URL. The sample also exhibits a PDF link farm heuristic, indicating a large number of external links, with one pointing to a known malicious redirector.

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.com/pify?keyword=b%25C3%25ADblia+de+estudo+holman
- http://mavop.lifitmoms.com/uploads/1/3/0/7/130776485/putivumis-xofuv.pdf
- https://cdn.shopify.com/s/files/1/0428/8380/9443/files/73385097143.pdf
- https://cdn.shopify.com/s/files/1/0437/6684/1505/files/bal_brahmachari_video_songs.pdf
- https://cdn.shopify.com/s/files/1/0431/5702/9019/files/48807627538.pdf
- https://cdn.shopify.com/s/files/1/0433/9345/0134/files/islamic_calendar_2020_pakistan.pdf
- https://cdn.shopify.com/s/files/1/0436/1817/3086/files/logitech_anywhere_mx_manual.pdf
- https://cdn.shopify.com/s/files/1/0433/4062/8136/files/88325925655.pdf
- https://cdn.shopify.com/s/files/1/0429/5432/6179/files/23476457863.pdf
- https://cdn.shopify.com/s/files/1/0434/5928/1048/files/33198000177.pdf
- https://cdn.shopify.com/s/files/1/0436/6244/2646/files/lunadumuxesajaz.pdf
- https://cdn.shopify.com/s/files/1/0433/4613/3157/files/69586227274.pdf
- https://cdn.shopify.com/s/files/1/0430/6622/8898/files/charmed_season_1_episode_14.pdf
- https://cdn.shopify.com/s/files/1/0432/0277/3156/files/83488216220.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_off00006172.bin` `762f8a54a8915d5d9b6eb82dc1b9a60b2932380c9ffa91aae38573398f507a6d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6172	5212 bytes
`font_01_sfnt_off00007301.bin` `3874625a6ab091e6d0c2172c97a965cd39e5ea43a3b240bb02d7ed9f55ca47cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7301	12556 bytes

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