PDF malware analysis — malicious · ae86654035991283

MALICIOUS

PDF

38.9 KB Created: 2020-08-14 16:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c837465334387a5efc6839acacea8934 SHA-1: c88563787b240baf84be141e1fb7bc263eb32809 SHA-256: ae866540359912832e44973ee595a703fe324641ec44433c6c123730b45c28c6

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, and numerous other links to external PDFs hosted on various domains, suggesting a link-farming or redirection scheme. No scripts were extracted from this sample.

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=recipe+with+dried+bean+curd+sheets
- http://fofutesu.focusedlifecoaching.org/uploads/1/3/0/7/130738786/cceb95.pdf
- http://files.zagarefringe.com/uploads/1/3/0/8/130814021/gifikagipodawe.pdf
- http://files.a4ppodcast.com/uploads/1/3/0/9/130969371/sajimatujodad.pdf
- https://cdn.shopify.com/s/files/1/0435/1374/1472/files/755541310.pdf
- https://cdn.shopify.com/s/files/1/0437/2021/2635/files/114_chakras.pdf
- https://cdn.shopify.com/s/files/1/0432/9698/1147/files/29852926083.pdf
- https://cdn.shopify.com/s/files/1/0435/5050/7167/files/wizejigidapurewik.pdf
- https://cdn.shopify.com/s/files/1/0430/7379/8306/files/xebajapixur.pdf
- https://cdn.shopify.com/s/files/1/0436/1850/0765/files/debate_competition_rules_and_regulations.pdf
- https://cdn.shopify.com/s/files/1/0434/9899/5864/files/vetuluzexumimon.pdf
- https://cdn.shopify.com/s/files/1/0430/9932/4580/files/36632776985.pdf
- https://cdn.shopify.com/s/files/1/0429/8643/8807/files/vojitovufofawumoro.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_off00005ab4.bin` `fc1a9a95b58ae90ff7551530994e5fabf34e5467d12248f926ddc6e048370505`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5AB4	5368 bytes
`font_01_sfnt_off00006cf4.bin` `9211acbb66a8498a21cff4504d88fc8af05ec371f477b23043bcd34ca313c56c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CF4	10072 bytes

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