PDF malware analysis — malicious · a3e9160c0db091ee

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 20:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0ad6efef8aabe56ba20b8c0f6f51ab7c SHA-1: c3820c51fb2aba35a1c0ed26ef980e3028f41c7a SHA-256: a3e9160c0db091eee1bcc0d818ded6f8bfa26041adde112103fea36775c82d01

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing numerous external links, suggesting a link-farming or redirection tactic.

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=all+about+me+sheets+for+students
- https://static.usrfiles.com/ugd/b8c837_642773ac15ce4b6585d5d3bfa5f34a20.pdf
- https://static.usrfiles.com/ugd/902d29_1d584aa744b945a2b875be8ef6fa0636.pdf
- https://static.usrfiles.com/ugd/1849a1_2eb8590e411946059d0d773a54097e73.pdf
- https://static.usrfiles.com/ugd/a48928_f5ab154035234a1484d7bfd486e19d32.pdf
- https://static.usrfiles.com/ugd/ae059d_9a7557b8b94848ea809359baa36f61c2.pdf
- https://cdn.shopify.com/s/files/1/0430/7963/1012/files/nodarebedo.pdf
- https://cdn.shopify.com/s/files/1/0430/6799/8362/files/51563675842.pdf
- https://cdn.shopify.com/s/files/1/0438/2624/9885/files/oregonlive_printable_tv_listings.pdf
- https://cdn.shopify.com/s/files/1/0431/5866/7415/files/beehive_class_9_chapter_5.pdf
- https://cdn.shopify.com/s/files/1/0432/5202/3458/files/kasusijaj.pdf
- https://static.usrfiles.com/ugd/b8c837_b0488c9653454262809efc29948d737d.pdf
- https://static.usrfiles.com/ugd/ca32a8_b36ab4c80fc64d03b8b367b137e30dd0.pdf
- https://static.usrfiles.com/ugd/b8c837_fb6451e830434a869b0256e0a060551a.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_off0000588f.bin` `0e9f31550eeeca3bf14fbcf83e2ee12becd86b8175947cc920311d9eef044849`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x588F	5276 bytes
`font_01_sfnt_off00006a55.bin` `498daacd90cf2e0b7cb86b277e9ca1b0531202cf01331b790bafab9d1c7c4222`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A55	10060 bytes

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