PDF malware analysis — malicious · 1b833dd0f1f14758

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 11:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 21d076b8243e3427578d552c23f20f58 SHA-1: 502695a4d669da57bcfb84fb4e43bbd3c4955ccf SHA-256: 1b833dd0f1f1475863023ac434357061e31d8bc13a0341731440eb12eff82165

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure: https://ttraff.link/wix?keyword=baburnama+bangla+pdf. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=baburnama+bangla+pdf
- https://static.usrfiles.com/ugd/b8c837_9e4d68cb59ec4e08b0337687bd48d99e.pdf
- https://static.usrfiles.com/ugd/b8c837_c24c944a9cb046c1acfeb53a213222cb.pdf
- https://static.usrfiles.com/ugd/ae15ca_b88074c3c2f845c4bf2770c652daaee6.pdf
- https://static.usrfiles.com/ugd/b8c837_73bd2cffd2074b3da95b4760d81bd000.pdf
- https://static.usrfiles.com/ugd/3cb679_fb6c115438e949eeaef6279dcb889afa.pdf
- https://cdn.shopify.com/s/files/1/0449/8325/5198/files/homemade_glue.pdf
- https://cdn.shopify.com/s/files/1/0432/7273/2836/files/getapovenaxite.pdf
- https://cdn.shopify.com/s/files/1/0452/1276/2263/files/59806423496.pdf
- https://static.usrfiles.com/ugd/6cfc61_3df41934066b41d8b69dbb185e966739.pdf
- https://static.usrfiles.com/ugd/b8c837_b2c3427f58f145edbda03a8c7c7d935a.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000068e8.bin` `56e5036b120b21fd2e9c04ece4741441845c02bf81365c270bb2858e09e33c25`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68E8	5372 bytes
`font_01_sfnt_off00007b13.bin` `0e3e06d8a5f47b639278f97203beed44fc6c9ba9ef9cdbc25ac2c1973c4623f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7B13	10216 bytes
`font_02_sfnt_off00009e1c.bin` `563934106e0c520c2602b169801a3047b014d18fb31a75ca34931415d038b063`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9E1C	16436 bytes

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