PDF malware analysis — malicious · 22c6641dbafb8e21

MALICIOUS

PDF

47.4 KB Created: 2020-09-03 18:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 301fded0ee2e3d86ee451521fc785c3d SHA-1: d3d4c964773cb86b37e60ea1a2189965da815d46 SHA-256: 22c6641dbafb8e2162c5c8c9506e39e266b66cfbe90b7be6f64282191258447b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains a mass of external links, many pointing to benign content, but one critical link directs to a known malicious redirector at `ttraff.club`. The document body, though heavily obfuscated, contains the URL `https://ttraff.club/wix?keyword=maths+division+worksheets+year+6`, suggesting a lure to download further malicious content disguised as educational worksheets. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=maths+division+worksheets+year+6
- https://cdn.shopify.com/s/files/1/0433/9308/9692/files/hyundai_xg350_repair_manual_online.pdf
- https://cdn.shopify.com/s/files/1/0429/8942/0695/files/58920025505.pdf
- https://cdn.shopify.com/s/files/1/0433/7424/8097/files/ribipixafofagaroge.pdf
- https://static.usrfiles.com/ugd/b444d4_6f582cc397f24b708aba39a53051ae07.pdf
- https://static.usrfiles.com/ugd/7ff653_710bb9910801417483254f1d515c2d57.pdf
- https://cdn.shopify.com/s/files/1/0429/5468/6617/files/ccie_and_ccde_evolving_technologies_study_guide_download.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vololo.pdf
- https://static.usrfiles.com/ugd/c33cdb_e83ba9fbaf1448478d24bb001231b08c.pdf
- https://static.usrfiles.com/ugd/9ff9b8_754c37cb4dc34296ba34a39f67da040c.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006dae.bin` `efa2093431b145678b8ebf8be85c6ba9effb1fb7892889404dc04bab06526df3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6DAE	5148 bytes
`font_01_sfnt_off00007f3a.bin` `f9a5ce2c00905da60a75e3e1d4385fe39e25d3f2c56877d235b45b29eb42a43d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F3A	10456 bytes
`font_02_sfnt_off0000a2fe.bin` `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA2FE	4324 bytes

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