PDF malware analysis — malicious · 4843d1445f70e1b0

MALICIOUS

PDF

50.4 KB Created: 2020-08-05 16:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 318f5219c520039245246e4804b18c4a SHA-1: b3605065283aca7fe0b75a55c980d7582285c3f0 SHA-256: 4843d1445f70e1b06a4bdbe1dcea16494d2c6b0326c092b34ddf10bfd06b6f60

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious link disguised as a 'pmay application form pdf 2020' which redirects to a known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files. The ML classifier strongly indicated maliciousness, supporting the presence of a 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.cc/pify?keyword=pmay+application+form+pdf+2020
- http://files.pullpal.com/uploads/1/3/1/4/131453823/9787876.pdf
- http://files.peldongaming.com/uploads/1/3/1/6/131606186/dopovowigik-wedeven-suvolopabo-zojugitag.pdf
- http://files.raewater.com/uploads/1/3/1/4/131407511/labova.pdf
- https://cdn.shopify.com/s/files/1/0430/2651/4077/files/49050060969.pdf
- https://cdn.shopify.com/s/files/1/0435/2226/1143/files/vuwibuvoje.pdf
- https://cdn.shopify.com/s/files/1/0429/2050/9596/files/dabovikenovulunuk.pdf
- https://cdn.shopify.com/s/files/1/0430/1701/1353/files/tawunovakot.pdf
- https://cdn.shopify.com/s/files/1/0434/3175/5932/files/zumotedikokeme.pdf
- https://cdn.shopify.com/s/files/1/0430/3772/0733/files/kudelomosuguwukiruzip.pdf
- https://cdn.shopify.com/s/files/1/0434/6124/7138/files/83628522012.pdf
- https://cdn.shopify.com/s/files/1/0431/0247/0306/files/kepipe.pdf
- https://cdn.shopify.com/s/files/1/0432/9324/5590/files/67213076560.pdf
- https://cdn.shopify.com/s/files/1/0433/7349/4430/files/venepogezeluveni.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_off000083b3.bin` `f6d7d72199c119f39973600ee5bd851e520738c2649c5929eb1a6aceafff7287`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83B3	5500 bytes
`font_01_sfnt_off0000965d.bin` `a97d474dd4505a408f10c3cb6fc3024ed56799d72c1e6e9337583fe97671c566`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x965D	12292 bytes

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