PDF malware analysis — malicious · f98953469982f473

MALICIOUS

PDF

33.9 KB Created: 2020-08-30 21:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2d25f43aff439a3b8600be8d36e123e0 SHA-1: 510552e12b79130ec959723f31e3ea260aef51c0 SHA-256: f98953469982f47357e8e29991649db23c8621588106f01bc8cfe1d65e37a7cc

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as educational content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for educational worksheets. The presence of numerous links to static.usrfiles.com suggests a link farm used for SEO poisoning to drive traffic to the malicious redirector.

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/wix?keyword=conjunction+worksheets+for+grade+5+w
- https://static.usrfiles.com/ugd/ed64d2_ca57342df4b3486286917e68c87da53d.pdf
- https://static.usrfiles.com/ugd/b8c837_1eb70771c05c47339808ce0a2527449b.pdf
- https://static.usrfiles.com/ugd/d17951_7b7b5b3b86244fe7a355ab87e33479f2.pdf
- https://cdn.shopify.com/s/files/1/0431/0440/3613/files/pokuzarinumapamofuno.pdf
- https://static.usrfiles.com/ugd/40b9e6_d7e69ef150d040819d6f4433402330ce.pdf
- https://static.usrfiles.com/ugd/5be868_43fc9cc53c5d4a699ff588637b27e8e8.pdf
- https://static.usrfiles.com/ugd/3bf302_f5663b9fd70e4f69a762ad2c687537be.pdf
- https://static.usrfiles.com/ugd/3e5d97_529f67c0a4d14fdda36db6b0cb91ab5f.pdf
- https://cdn.shopify.com/s/files/1/0459/3126/6215/files/cisco_2960_48_port_poe_switch_datasheet.pdf
- https://cdn.shopify.com/s/files/1/0437/6782/4533/files/notitevadewetu.pdf
- https://cdn.shopify.com/s/files/1/0440/7332/0600/files/tujejumaxadilibu.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_off000046f8.bin` `8e246edda4690b9e7f73e7ae5bb40aba7f86cadaf0171c47d02307b2ed61707d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x46F8	5512 bytes
`font_01_sfnt_off000059cd.bin` `24c7a0b74aeb64009c4f1cfb90a98949f8dffbe6a6cfb4b669a9a0b3367e58cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x59CD	9740 bytes

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