PDF malware analysis — malicious · 30722aa16bd58d93

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 08:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cffe912527316b38567aa93d7745b05c SHA-1: f3fa81e14a35dc0e9ae8f46ddd7c91103fb4bd88 SHA-256: 30722aa16bd58d93d9cb7402488a47ae4b3be0eadca483128d96785acf8c1cc6

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, forming a link farm. One of these URLs, 'https://ttraff.cc/wix?keyword=precalculus+practice+test+with+answe', is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, and the document body is heavily obfuscated.

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/wix?keyword=precalculus+practice+test+with+answe
- https://static.usrfiles.com/ugd/5b9a87_b900621344a149d583b969cd61c1117f.pdf
- https://static.usrfiles.com/ugd/6cf392_e30873439d6a419ba9e90929985d103a.pdf
- https://static.usrfiles.com/ugd/89363e_308bb063e85e4c37881775f5fcf10c1e.pdf
- https://static.usrfiles.com/ugd/79e0dc_666c8865e91c4a1bbc21fa4329c6f25b.pdf
- https://static.usrfiles.com/ugd/b444d4_1da0fe9b42da4e118ee3992c11574f69.pdf
- https://cdn.shopify.com/s/files/1/0429/7680/5023/files/my_boy_gba_emulator_games_for_android.pdf
- https://cdn.shopify.com/s/files/1/0432/2423/6199/files/nurokub.pdf
- https://static.usrfiles.com/ugd/4dd980_55ff2a86aaf94d3b879f3bfe7066f692.pdf
- https://static.usrfiles.com/ugd/b8c837_7e0c966e8f864b42ba476e77a73a74d3.pdf
- https://static.usrfiles.com/ugd/8e1900_aaf1fca3a4ed4694b7d3a082c9e8e9d1.pdf
- https://static.usrfiles.com/ugd/b8c837_13a468482e48450dbbfc3fc476ab9681.pdf
- https://static.usrfiles.com/ugd/b8c837_818725ec4e3a461faa8b9a5a6ebe5ba0.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_off000061d9.bin` `06b970fad775d437219356d8b17a8567c68add75b068ab3af662d7bcfc7b2fc9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61D9	5116 bytes
`font_01_sfnt_off00007342.bin` `57edab206cb7545fd89de9a1312871a3940acee2fe985d810e54d94d7357db30`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7342	10476 bytes

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