PDF malware analysis — malicious · 84854c46e045956d

MALICIOUS

PDF

35.1 KB Created: 2020-08-31 23:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cea1fbf94560c8013adffaa7fa51e273 SHA-1: c4f18a83cdcffb5ac2ebc36e279ad6f894fdf1dc SHA-256: 84854c46e045956d49572a79e7c4d99cb91d96662eb71b901e995267de81ea9c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as an academic report. The document body and embedded URLs suggest a lure to external content, likely for further exploitation or credential harvesting. The ML classifier strongly indicated maliciousness.

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=aqa+a+level+physics+examiners+report+2018
- https://static.usrfiles.com/ugd/b8c837_6718665c2c244bb0a2cd4bbcf9101354.pdf
- https://static.usrfiles.com/ugd/d01287_081628d88edc48b4ac8714e1fac3947f.pdf
- https://static.usrfiles.com/ugd/9ea9b6_60f9ef15da844bfab0eb5bc879147803.pdf
- https://static.usrfiles.com/ugd/30e015_1591cd1912e5474297ccf14c0d7f5316.pdf
- https://cdn.shopify.com/s/files/1/0431/3828/5734/files/bajiwow.pdf
- https://cdn.shopify.com/s/files/1/0435/8720/7327/files/airtel_tv_app_apk_latest_version.pdf
- https://cdn.shopify.com/s/files/1/0428/0749/2775/files/76653932320.pdf
- https://cdn.shopify.com/s/files/1/0429/8981/3909/files/vokedozepojagoxeko.pdf
- https://cdn.shopify.com/s/files/1/0431/9097/6673/files/adjective_adverb_exercise.pdf
- https://static.usrfiles.com/ugd/f46427_2c8b4b4748eb40608129693241c7b170.pdf
- https://static.usrfiles.com/ugd/b8c837_86fd3b4a1b0e47df8cd87c2ef50731de.pdf
- https://static.usrfiles.com/ugd/b8c837_2fd0a6254a624316afc839a0cfb07ffb.pdf
- https://static.usrfiles.com/ugd/b8c837_72ac00d833ba4b14b2a37e71ec36f944.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_off00004a61.bin` `e04ed8244d143783bca50ca18f89741493df1f336f450e9a4730a246d47de479`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4A61	6040 bytes
`font_01_sfnt_off00005edb.bin` `38648619010cc73d9af081a1482ae093c31cb978c06dd9b8a7c0f93fd8462ed6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EDB	9636 bytes

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