PDF malware analysis — malicious · 83976fb0f3e96d6b

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 00:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ddc0cb50c9dfa7762eeab77abd3117a7 SHA-1: e00b61fe232a41b16e4c232b6c08d5b6b64d04f4 SHA-256: 83976fb0f3e96d6b882ad7b9751acf230e6bd75e168676b6ac9400c1bc9d5f19

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector at `ttraff.ru`. The document body, though malformed, contains the same URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=descargar+dreambox+control+center
- https://cdn.shopify.com/s/files/1/0437/2656/9633/files/vogapivepaladurumub.pdf
- https://cdn.shopify.com/s/files/1/0432/7217/5784/files/compressing_files.pdf
- https://cdn.shopify.com/s/files/1/0447/9116/9185/files/jurnal_asbabun_nuzul.pdf
- https://cdn.shopify.com/s/files/1/0433/8424/2334/files/700_free_manipulation_background_for_editing.pdf
- https://static.usrfiles.com/ugd/b8c837_28e3e3daad48408fa536b1a636621400.pdf
- https://static.usrfiles.com/ugd/de65f7_fe9a188162a640419130dfce60eb0775.pdf
- https://static.usrfiles.com/ugd/d94ae5_c3487e83d12542f9b940b3188e80901f.pdf
- https://cdn.shopify.com/s/files/1/0431/9209/0788/files/calculus_2_notes.pdf
- https://cdn.shopify.com/s/files/1/0440/4042/1541/files/8_weeks_to_sealfit.pdf
- https://cdn.shopify.com/s/files/1/0429/8801/1673/files/xuwumulebiwifivowule.pdf
- https://cdn.shopify.com/s/files/1/0431/0515/7282/files/30428859182.pdf
- https://static.usrfiles.com/ugd/238140_2ad275ccd0604ab98d633db37aee3a92.pdf
- https://static.usrfiles.com/ugd/b8c837_643fd96829174a5bada6054e7027b46e.pdf
- https://static.usrfiles.com/ugd/b8c837_bdf838f6053b4991886d3a1a2d6d2eaf.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_off000066e1.bin` `c8cc90f54a3811ed0f6838490e5fe6d7384b00fb4afdd591486b6089be02e5e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x66E1	5468 bytes
`font_01_sfnt_off0000795b.bin` `d91248d1019b29cc359194a50e683eb44636522553a2d9171918431d0d79cb54`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x795B	10860 bytes

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