PDF malware analysis — malicious · 41c937b39f051ba3

MALICIOUS

PDF

36.7 KB Created: 2020-09-06 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e096b779d12c7600b498092a478d2c9b SHA-1: ff41de7eef954f51f41fd8f0d7b495dec742bfbd SHA-256: 41c937b39f051ba3301467dd07b7a66bde72629aa89284af7ebd4f8237754532

154 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.club, which is disguised with a keyword related to sheet music. The document also functions as a link farm, pointing to numerous benign Shopify URLs, likely to improve SEO and mask the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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=domenico+scarlatti+sheet+music
- https://cdn.shopify.com/s/files/1/0434/2562/8327/files/c_overload_assignment_operator.pdf
- https://cdn.shopify.com/s/files/1/0433/3446/7752/files/burenokodasusunibupamoku.pdf
- https://cdn.shopify.com/s/files/1/0435/4405/1864/files/23509962000.pdf
- https://cdn.shopify.com/s/files/1/0435/1547/8176/files/lagexisemad.pdf
- https://cdn.shopify.com/s/files/1/0439/4971/9720/files/reading_comprehension_pre_intermediate.pdf
- https://cdn.shopify.com/s/files/1/0431/2960/2205/files/14537230194.pdf
- https://cdn.shopify.com/s/files/1/0433/4410/1544/files/38285209724.pdf
- https://static.usrfiles.com/ugd/f1780b_e7064fa6df974bb58b2bf57a4ec25fdd.pdf
- https://static.usrfiles.com/ugd/2994dd_dd0f51e859d74be1ac9ff25f21c2bbf8.pdf
- https://static.usrfiles.com/ugd/7e0eb0_409df404c2e64ebab687421ad2e0a026.pdf
- https://cdn.shopify.com/s/files/1/0432/4173/4307/files/31820671017.pdf
- https://cdn.shopify.com/s/files/1/0438/2811/7661/files/vuwirojud.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_off00005366.bin` `9169af941443951cd0a6abb40b0d0a98e9fbc503d5dfb5ae9a034d27b05a3402`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5366	5036 bytes
`font_01_sfnt_off00006459.bin` `e50b09e87e25b9eaa297436d9ed69c7ddbfc81f26264a8cd841f00f05537d0cc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6459	9888 bytes

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