PDF malware analysis — malicious · 771a11bc4d29617d

MALICIOUS

PDF

45.5 KB Created: 2020-08-17 10:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cb76cc4ca9a79bfcf93d5d29929a22de SHA-1: 41994e282b877a24523bfd7f5eadad7ef76ac808 SHA-256: 771a11bc4d29617d2d16dd8225c6e15cae979fa3cbce4753487294f5d03cb720

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The PDF also features a link farm, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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=tik+tok+audio+song++online
- http://files.armstrongchoirs.org/uploads/1/3/0/7/130740211/gepilolomilarakop.pdf
- http://files.scalestuff.org/uploads/1/3/1/4/131483371/9846c66b2a2c4.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0436/2534/9283/files/autismo_diagnostico.pdf
- https://cdn.shopify.com/s/files/1/0429/9345/1159/files/fonizedotawupomorovak.pdf
- https://cdn.shopify.com/s/files/1/0433/9413/8277/files/alternator_problems_and_solutions.pdf
- https://cdn.shopify.com/s/files/1/0433/7539/4977/files/juxekanakilazamiw.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdf
- https://cdn.shopify.com/s/files/1/0434/1995/9463/files/labour_attendance_card.pdf
- https://cdn.shopify.com/s/files/1/0431/2442/4853/files/92889996899.pdf
- https://cdn.shopify.com/s/files/1/0431/7242/9980/files/jajonepovokimidal.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000067fb.bin` `4352e761c190e6924140d95081ea563e8bac2b60c7bdb722b23a78a60388713c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x67FB	4912 bytes
`font_01_sfnt_off000078b4.bin` `fc4021e369c7333a3e2698b65512cd5ca33aa0a3949f6c925ad90d66ca89f0ce`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x78B4	2528 bytes
`font_02_sfnt_off000083e5.bin` `3d9823d01688ee657c6ba89d68a0a1dc954ceed5ca64deba2e48067f09449de5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83E5	10844 bytes

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