PDF malware analysis — malicious · 2debd533c28bc841

MALICIOUS

PDF

50.9 KB Created: 2020-08-29 08:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0acd4a4f0479f4e817ed140832716c5d SHA-1: 28b40e864b05d9f2f6f5b49be38d97810902c5c7 SHA-256: 2debd533c28bc841fa7ec0f4d41237a64ba3b060fa6fab51a1309ac3c11af9b1

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The document body, while appearing to be a book title, is likely a lure to disguise the malicious intent.

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=a+manual+for+writers+of+research+papers+theses+and+dissertations+9th+edition+pdf
- https://static.usrfiles.com/ugd/b8c837_3f14a9d7dc1f4e0186bb33fb7c1de131.pdf
- https://static.usrfiles.com/ugd/b8c837_bcd6fcef16a249e19f03c60d404960e0.pdf
- https://static.usrfiles.com/ugd/b8c837_a780ce450f614092ad228dac8e8e6997.pdf
- https://static.usrfiles.com/ugd/b8c837_edb856a9c6ec4f37b96d4757c6fd5147.pdf
- https://cdn.shopify.com/s/files/1/0432/2040/2336/files/payment_coupon_book_template_free_word.pdf
- https://static.usrfiles.com/ugd/b8c837_c1c7999ccea14f1688f8a99001886d89.pdf
- https://static.usrfiles.com/ugd/b8c837_473ce8f7b28a4f4c85454c13738d994b.pdf
- https://static.usrfiles.com/ugd/b8c837_972a347c37134841bd889e0d19d56688.pdf
- https://static.usrfiles.com/ugd/b8c837_00599d8ac6fc4720becba405955ae7e7.pdf
- https://static.usrfiles.com/ugd/b8c837_41f77f6964174f279e88c00b328106d1.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_off000079cc.bin` `c435a16e77f872da2d29cb50e034db7862052fbc47113ac120adc2cd0c9c86e4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79CC	5512 bytes
`font_01_sfnt_off00008c63.bin` `477060db8f0da6ffca338111d91f1637ef8b1e376797ee73d2f58003aa0dbb68`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C63	10444 bytes
`font_02_sfnt_off0000afc4.bin` `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAFC4	4324 bytes

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