PDF malware analysis — malicious · 88ff64c31b1c9948

MALICIOUS

PDF

38.0 KB Created: 2020-08-23 04:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 117e86ff827cdea6126c9b55b2fa980e SHA-1: e0e533bcc5b9fc993ec85f3e1dc0a0b470d1c4c9 SHA-256: 88ff64c31b1c99485fdce9457b4b21a70c84458a07fc0f9ab0220671b0a7eff8

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that point to a known malicious redirector, disguised with keywords like 'bralette size guide'. The document body, though heavily obfuscated, also contains these URLs, suggesting an attempt to trick users into clicking them. The presence of numerous external PDF links further indicates a link farm or redirection strategy, likely for phishing or malware delivery.

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=bralette+size+guide+hollister
- http://wakixewa.montaukmist.com/uploads/1/3/0/7/130775173/ef9977384.pdf
- http://files.marthastokoe.com/uploads/1/3/0/7/130738928/gulanesesidakeloj.pdf
- http://files.jeanetteschevers.com/uploads/1/3/1/1/131164531/cd97871.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0431/5417/8216/files/110310656.pdf
- https://cdn.shopify.com/s/files/1/0432/9072/2469/files/fupisa.pdf
- https://cdn.shopify.com/s/files/1/0429/3338/7423/files/jomulisefiw.pdf
- https://cdn.shopify.com/s/files/1/0430/4620/7637/files/50558464345.pdf
- https://cdn.shopify.com/s/files/1/0461/3747/5225/files/broken_screen_android_phone_data_recovery.pdf
- https://cdn.shopify.com/s/files/1/0432/6857/1294/files/56106680017.pdf
- https://cdn.shopify.com/s/files/1/0440/6693/0840/files/wubenuramisagadumapa.pdf
- https://cdn.shopify.com/s/files/1/0427/4143/2487/files/29542747051.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_off0000573c.bin` `35df60d16d37e30a1a2a391e0f41e664712dc604d26fa6b7ddf575950f067625`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x573C	5188 bytes
`font_01_sfnt_off000068d3.bin` `60a6c38dc07af542d1d1badf5b1723477c3d9d8afbaa246f192b767d864b60b3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68D3	10160 bytes

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