PDF malware analysis — malicious · 1c4cfc3cfb5b2337

MALICIOUS

PDF

51.7 KB Created: 2020-08-23 23:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 254cac3a94067218a60a131e51880f42 SHA-1: ab930910dda7107008bb5bf0acab47cbb6cf9637 SHA-256: 1c4cfc3cfb5b23372a504259a520c3b5d4d82a73fbc51c4b245dc63ed87df166

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, with many embedded URLs pointing to Shopify domains. The primary malicious URL is https://ttraff.ru/pify?keyword=titanic+imdb+parents+guide, which is likely used to redirect users to a malicious site.

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/pify?keyword=titanic+imdb+parents+guide
- http://files.slicklimo.com/uploads/1/3/1/8/131856050/dupezagutu.pdf
- https://cdn.shopify.com/s/files/1/0435/5181/7879/files/bikewoka.pdf
- https://cdn.shopify.com/s/files/1/0432/0490/3069/files/gejoxukerosolepawa.pdf
- https://cdn.shopify.com/s/files/1/0434/7474/7545/files/87702311152.pdf
- https://cdn.shopify.com/s/files/1/0433/1254/5950/files/loduvuwiwudetebifes.pdf
- https://cdn.shopify.com/s/files/1/0437/3096/0549/files/walden_thoreau_gratis.pdf
- https://cdn.shopify.com/s/files/1/0433/4141/4552/files/78819802283.pdf
- https://cdn.shopify.com/s/files/1/0434/8179/2664/files/gobowozofimu.pdf
- https://cdn.shopify.com/s/files/1/0432/1925/5454/files/tafozomum.pdf
- https://cdn.shopify.com/s/files/1/0431/5539/0630/files/86725219962.pdf
- https://cdn.shopify.com/s/files/1/0431/1223/5159/files/98951082994.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007df1.bin` `c39078fcb2f88d204eefd4649e8b345aad25327356ac8bea655da9bf6f9445ec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7DF1	5220 bytes
`font_01_sfnt_off00008f88.bin` `637fb09c53f5c8b36962b35771bdde02473e8fbe0a365e60f11d9fc6d1d4f70c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F88	10668 bytes
`font_02_sfnt_off0000b408.bin` `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB408	4324 bytes

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