PDF malware analysis — malicious · a50b88fec9c37513

MALICIOUS

PDF

42.0 KB Created: 2020-09-06 07:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fa7a7eaef7251b4209552c99906accbc SHA-1: 224b2920d85a7c2f47e4b8e2ba40553f202e27b8 SHA-256: a50b88fec9c375130214d67bf033a258d6c959ec316c22b31ccd249faa506517

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for exam results, directing the user to a malicious URL. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=bise+grw+matric+result+2019+gazette
- https://static.usrfiles.com/ugd/3f80ec_3b49ba79d5484418a0a36ac10cba9077.pdf
- https://static.usrfiles.com/ugd/682d1c_6333d8e59061477494fed9f5b82e777c.pdf
- https://static.usrfiles.com/ugd/3cb679_9a967f378fc548829c28985d8b6148d6.pdf
- https://static.usrfiles.com/ugd/0cd3a8_6ded86aca3eb4787b8362c5e46751b81.pdf
- https://static.usrfiles.com/ugd/01bc73_78fb38f1eef141d1a621cb34966634b5.pdf
- https://cdn.shopify.com/s/files/1/0434/8814/9668/files/sitomekalibebiwomil.pdf
- https://cdn.shopify.com/s/files/1/0429/9938/2170/files/mapa_cajon_del_maipo.pdf
- https://cdn.shopify.com/s/files/1/0433/9964/3286/files/tigufos.pdf
- https://cdn.shopify.com/s/files/1/0429/5491/5993/files/csgo_fps_boost.pdf
- https://cdn.shopify.com/s/files/1/0429/0222/5059/files/lowuxevomurofugezip.pdf
- https://cdn.shopify.com/s/files/1/0463/2667/7665/files/bot_telegram_musica.pdf
- https://static.usrfiles.com/ugd/b8c837_a890250f56a84113a07372589ff5293c.pdf
- https://static.usrfiles.com/ugd/16a96a_367935de7198441babf9e7e0b15b6d45.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_off00006354.bin` `2a1cde3996ab279ac3c42be289408d12f5c2f46cfa9d77540cfcad2545ad180c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6354	5792 bytes
`font_01_sfnt_off00007713.bin` `b9b665f8ed2988408dbcf78e7ad91ef916c4457f2ae089e8b9571083dfa1ae5c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7713	10572 bytes

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