PDF malware analysis — malicious · b2fe451a57804b94

MALICIOUS

PDF

39.1 KB Created: 2020-08-15 03:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cae562300dbc13c9b522b2a36d7ec7d5 SHA-1: 7afe4dfd55cb7525024d3db618557cb73dddfc0e SHA-256: b2fe451a57804b94a4305a8fe010ec5b4dd72e0bb15f1d38e92eff51bc413f8e

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a deceptive prompt disguised as an exercise, directing the user to click on a malicious URL. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a link farm and a redirector to known malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=rewrite+the+sentence+into+negative+form, which is likely used to deliver a secondary payload or redirect to a phishing 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.cc/pify?keyword=rewrite+the+sentence+into+negative+form
- http://luvupixur.dkgthetazeta.org/uploads/1/3/0/7/130740221/kowezetixemalux.pdf
- https://cdn.shopify.com/s/files/1/0430/6858/8194/files/kebowo.pdf
- https://cdn.shopify.com/s/files/1/0432/4166/8775/files/mevititigupepidepaw.pdf
- https://cdn.shopify.com/s/files/1/0433/2175/3758/files/bujimotidezodafufuk.pdf
- https://cdn.shopify.com/s/files/1/0428/7630/5564/files/adjective_or_adverb_exercises_elementary.pdf
- https://cdn.shopify.com/s/files/1/0437/0441/8455/files/fuvekekubogag.pdf
- https://cdn.shopify.com/s/files/1/0428/6208/4262/files/42750042235.pdf
- https://cdn.shopify.com/s/files/1/0432/3111/7467/files/74097772301.pdf
- https://cdn.shopify.com/s/files/1/0431/3199/4280/files/48355633037.pdf
- https://cdn.shopify.com/s/files/1/0430/9552/3485/files/xesawawazedipukag.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/
- https://cdn.shopify.com/s/files/1/0428/7630/5

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005835.bin` `b108a8cab1b71de0a3c85aeab59bc1bf9338fae223a4ecae2596deb2e5ae1b6b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5835	5424 bytes
`font_01_sfnt_off00006a9b.bin` `058e298fca6ac0493a78d09b6089da25369a4ec7f5c1910dccafb337c1dda97c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A9B	11980 bytes

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