PDF malware analysis — malicious · a8a21923dcd61b72

MALICIOUS

PDF

39.1 KB Created: 2020-08-15 01:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d339fb90db7b71f8e71895879e9fbcc7 SHA-1: 6f6fde6b1ea7a1eabdf4cc47a3be38cbfd97c2eb SHA-256: a8a21923dcd61b72c5b879d3f6d30a564f0650db950ac72ea4455ba778b45208

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with a critical heuristic firing indicating a redirector link to 'https://ttraff.cc/wb?keyword=scaling%20questions%20pdf'. Another critical heuristic identified a PDF link farm, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the suspicious URL, reinforcing the redirection attempt.

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/wb?keyword=scaling%20questions%20pdf
- http://files.meadowsparkapts.com/uploads/1/3/1/6/131606140/01f99e.pdf
- http://tixusimug.az-tennisacademy.com/uploads/1/3/1/3/131379992/relelakinovivina.pdf
- http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdf
- http://files.hairbyshej.com/uploads/1/3/1/4/131437085/5895284.pdf
- https://cdn.shopify.com/s/files/1/0431/7567/4012/files/58005653866.pdf
- https://cdn.shopify.com/s/files/1/0430/3516/4835/files/glee_loser_like_me.pdf
- https://cdn.shopify.com/s/files/1/0440/5572/4197/files/41169985325.pdf
- https://cdn.shopify.com/s/files/1/0433/7418/2563/files/bd139_16_datasheet.pdf
- https://cdn.shopify.com/s/files/1/0438/7880/9755/files/numimerupazetonabik.pdf
- https://cdn.shopify.com/s/files/1/0428/8705/3475/files/37739952632.pdf
- https://cdn.shopify.com/s/files/1/0446/5026/6787/files/borrelia_spp.pdf
- https://cdn.shopify.com/s/files/1/0443/4070/7484/files/96610105537.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_off00005a10.bin` `1eeeaec44672e1594af31f61551f9f561c09cb7d55827ce70126b3f07e490a3f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A10	5456 bytes
`font_01_sfnt_off00006ca2.bin` `2b773b23bef4258226e4899d97a0cbb66643ec31264bcbfe7c2636078fb7ea2f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CA2	10240 bytes

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