PDF malware analysis — malicious · 6236601e81c1df21

MALICIOUS

PDF

37.7 KB Created: 2020-08-31 00:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b0f66abb18adbfc01b12efd3f1d19248 SHA-1: 0a9da93e0dfcbea95a736a816a24a617b188b926 SHA-256: 6236601e81c1df21b16fd7b4e4c0a222d09a010aab53ebbb5a9d17f03e271beb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=falar+ler+escrever+portugues+livro+pdf', which is also flagged as a malicious redirector. The presence of numerous other PDF links suggests a link farm designed to distribute malicious 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.cc/wix?keyword=falar+ler+escrever+portugues+livro+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0431/7813/1611/files/gikusidokidomurir.pdf
- https://cdn.shopify.com/s/files/1/0430/2969/2577/files/guxojajizasoti.pdf
- https://cdn.shopify.com/s/files/1/0431/3091/2934/files/77862396483.pdf
- https://cdn.shopify.com/s/files/1/0428/3678/7356/files/40763326685.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
- https://cdn.shopify.com/s/files/1/0430/0469/0581/files/davizejuzakadu.pdf
- https://static.usrfiles.com/ugd/4bb894_01ba17ae31004cafa6fe036e1bafc73c.pdf
- https://static.usrfiles.com/ugd/625844_1b32c5187240498b9f5f7460c1792a35.pdf
- https://cdn.shopify.com/s/files/1/0431/0315/8433/files/bony_to_beastly_workout_guide.pdf
- https://cdn.shopify.com/s/files/1/0435/7714/7547/files/62735999840.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_off000050c4.bin` `1fa2cbdd9aebe8d7b5c66f8394beeef1d2bf0364a52a3c12eda16744bcaeb665`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x50C4	5340 bytes
`font_01_sfnt_off00006304.bin` `582487098bc54c20bf50de396a3a3d6634cc3a4dd1d5ba1520e132fe0c46ca98`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6304	12768 bytes

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