PDF malware analysis — malicious · 1de525185a173742

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 17:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: aec0ff94cb8015b5a9900944b12681f3 SHA-1: 0629bd1d774866d23d7f4c2766d753e36eff1ba5 SHA-256: 1de525185a173742015f65cdc7b8e3bee941b4434c7eefa03a9225f172034c32

150 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to a 'management representation letter for tax audit', suggesting a social engineering lure. The presence of numerous embedded links, many pointing to shopify.com domains hosting other PDFs, indicates a link farm or a method to distribute further malicious content. No scripts were extracted, but the primary attack vector appears to be directing the user to malicious infrastructure via a deceptive document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=management+representation+letter+format+for+tax+audit
- http://files.24millstillrd.com/uploads/1/3/0/7/130739298/315719.pdf
- https://cdn.shopify.com/s/files/1/0431/3805/6354/files/vajolubilodagonif.pdf
- https://cdn.shopify.com/s/files/1/0435/8776/4387/files/weathering_with_you_trailer_2.pdf
- https://cdn.shopify.com/s/files/1/0440/5913/2056/files/javimakesuloxene.pdf
- https://cdn.shopify.com/s/files/1/0438/2657/7565/files/38137724312.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
- https://cdn.shopify.com/s/files/1/0432/6467/1909/files/52753692012.pdf
- https://cdn.shopify.com/s/files/1/0437/9066/3832/files/dark_vengeance_40k.pdf
- https://cdn.shopify.com/s/files/1/0437/1926/2363/files/salesforce_lightning_design_system.pdf
- https://cdn.shopify.com/s/files/1/0429/6402/5493/files/bojinoxilif.pdf
- https://cdn.shopify.com/s/files/1/0431/3972/7509/files/your_lie_in_april_music_sheet.pdf
- https://cdn.shopify.com/s/files/1/0431/0381/3781/files/86003855722.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27055139941.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84511803825.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_off00006f17.bin` `b2a76dc89a56570b27ac381e772e5a3590d69d49326267333f758f215565188d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F17	5436 bytes
`font_01_sfnt_off00008182.bin` `a86cd5f27878239df4810d9df617b646d62c3d2bb25be6a6add59bd1355cc715`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8182	10532 bytes

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