PDF malware analysis — malicious · 1843ff5807273335

MALICIOUS

PDF

58.0 KB Created: 2020-09-01 06:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a2d05d27be9653df3cc8f7b1cef0dc82 SHA-1: 2af9d74d2fdb89e6523c4ff92d6f79218424af18 SHA-256: 1843ff580727333559a676b0f45cbe781e4d3e21f7b2268940eb967ca338ccba

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'free bootstrap templates' and a URL that aligns with this lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.club/pify?keyword=free+bootstrap+templates++for+education
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/afe78f_047a9e2dbb7a41d79532c142970a2c0c.pdf
- https://static.usrfiles.com/ugd/09c3c7_2bd77fbba72e4e6ea575332191d8bffb.pdf
- https://static.usrfiles.com/ugd/b8c837_fb0899de63194060909ada918b713a7c.pdf
- https://cdn.shopify.com/s/files/1/0431/3173/2132/files/41704503918.pdf
- https://cdn.shopify.com/s/files/1/0434/6911/1461/files/ascii_meaning.pdf
- https://cdn.shopify.com/s/files/1/0427/8878/2236/files/tagafofopapovenelolixejun.pdf
- https://static.usrfiles.com/ugd/b8c837_4f8343cff1d749209f13e85b872057f1.pdf
- https://static.usrfiles.com/ugd/6924eb_a235f6dc2db648d8a9a62d093120ea99.pdf
- https://static.usrfiles.com/ugd/de3d83_a1a6a7f795f744fc9d933272ba955785.pdf
- https://static.usrfiles.com/ugd/2c8d66_9c136042c1704344be8728126b2eda2a.pdf
- https://static.usrfiles.com/ugd/b8c837_58cb417fc5a44158927dfaadcf54042e.pdf
- https://static.usrfiles.com/ugd/d3758e_21f1db95cb4e4f67866a25594bf35b0c.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000a474.bin` `c773666099a213cfd3faba65eedfef23efc4fe9499628c3920bf0f4a6c9f8f46`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA474	5396 bytes
`font_01_sfnt_off0000b6b4.bin` `63a7076bec67b5f04bef77fb7f832c509771734afbe2a133957144372364201d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB6B4	10580 bytes

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