PDF malware analysis — malicious · f9d19931998f965b

MALICIOUS

PDF

43.0 KB Created: 2020-09-09 14:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 32a8a315a9bef120118ea7c393d4c4cb SHA-1: c6e8da756c286c4a134db9084f6b6d3a08b0dea9 SHA-256: f9d19931998f965b7485de6d9eba4bf54d7435f8904a98b8814380eeef280485

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link disguised as a programming tutorial search result, which redirects to a known malicious domain. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm pointing to various benign-looking PDFs, likely to improve search engine ranking for malicious redirects. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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.me/wix?keyword=learn+basics+of+c+programming+pdf
- http://files.newcastlemastershockey.org/uploads/1/3/1/4/131483098/3878936.pdf
- http://files.rlx.space/uploads/1/3/1/4/131409200/4318698.pdf
- http://files.exmouthcaninecentre.co.uk/uploads/1/3/0/8/130874128/jenasaj.pdf
- https://cdn.shopify.com/s/files/1/0436/7620/5209/files/clinical_chemistry_bishop.pdf
- https://cdn.shopify.com/s/files/1/0428/6133/0598/files/carte_des_espaces_agricoles_en_france.pdf
- https://cdn.shopify.com/s/files/1/0428/8679/1334/files/91157190042.pdf
- https://static.usrfiles.com/ugd/89363e_a41fd2d7d7624df8a44f578802a1692e.pdf
- https://static.usrfiles.com/ugd/4cf28d_7139dceed25541f7b0edcd17d1b4b003.pdf
- https://static.usrfiles.com/ugd/b8c837_023fcff311f84dc89e92900234c5be53.pdf
- https://static.usrfiles.com/ugd/e78b77_a30c1bd17a034fef945d0173966369e4.pdf
- https://static.usrfiles.com/ugd/120874_de9995de4ce54b91b7a82f8dd2d1492c.pdf
- https://static.usrfiles.com/ugd/dad7b5_38ddfcf0c08c407eb5701304e6770d3b.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_off00006937.bin` `2bb4a14273ab2a3ee1db3b56c33ca1f6f06e386b9a6f4ee6fa0753c2acd1c5ff`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6937	5524 bytes
`font_01_sfnt_off00007bf0.bin` `1f5ecf3fe68fb735eb22fc15e92264761905bb1eba8ebfcc8a3f075d6c066b76`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7BF0	10476 bytes

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