PDF malware analysis — malicious · a41d4126a37e6ea9

MALICIOUS

PDF

40.6 KB Created: 2020-08-19 00:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c568ee3cc42ce9c07d56d9eafc47b58c SHA-1: 671a765008c32ca8b1273958fd134d048563bab9 SHA-256: a41d4126a37e6ea9919044962aa64c2e16d070fd64fd80a720601c7e5571b938

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Android version 9 screen recorder' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, which is a common tactic for distributing 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/pify?keyword=android+version+9+screen+recorder
- http://files.yogaandwork.com/uploads/1/3/1/3/131383604/8d2eb9e60b93.pdf
- https://cdn.shopify.com/s/files/1/0431/1977/1799/files/rerisugerolutug.pdf
- https://cdn.shopify.com/s/files/1/0433/6818/6024/files/calendrier_premier_league_2020_et_2020.pdf
- https://cdn.shopify.com/s/files/1/0436/0326/3650/files/convert_openoffice_to.pdf
- https://cdn.shopify.com/s/files/1/0431/1774/0199/files/poduromut.pdf
- https://cdn.shopify.com/s/files/1/0437/9272/8224/files/pdf_decrease_file_size.pdf
- https://cdn.shopify.com/s/files/1/0437/6412/1749/files/sebemo.pdf
- https://cdn.shopify.com/s/files/1/0433/4324/9563/files/40764444190.pdf
- https://cdn.shopify.com/s/files/1/0436/4248/6944/files/sijexonesut.pdf
- https://cdn.shopify.com/s/files/1/0428/4894/4284/files/78571503795.pdf
- https://cdn.shopify.com/s/files/1/0430/3742/5818/files/abstract_and_concrete_nouns_worksheet_5th_grade.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_off0000621b.bin` `ce7b9ee0004e6657e3386554853fb550fa1d415653457fd53be98d01e98df7e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x621B	4896 bytes
`font_01_sfnt_off000072d4.bin` `905b822a671be797b76de498be9abfd42391a5d63ab97be80cd2460f09b4cdf4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x72D4	10264 bytes

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