PDF malware analysis — malicious · 87261232c65697a1

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 22:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: da75b4bfb8f97f9fdad1e2e117076ff2 SHA-1: 3804a84768ffe506096dfe52b9aaf59e0e5ca301 SHA-256: 87261232c65697a15ae2b2db68ca0d5f86fda891d88b234b2871fc1f9fd47f87

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified it as a PDF link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the malicious redirector URL. This suggests the primary purpose is to lure users to malicious sites.

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=canvas+draw+background+image+android
- https://static.usrfiles.com/ugd/9b7d8a_b6c0247c14f646a6b2bf37c5e8c7ee55.pdf
- https://static.usrfiles.com/ugd/ea9bdf_48012b455b55461ab602c030e02c9e51.pdf
- https://static.usrfiles.com/ugd/822ecd_1e875f9c477c473c8ce9166c4924cd21.pdf
- https://static.usrfiles.com/ugd/b8c837_6542bf75d93e4f9884e5f9a695438c2a.pdf
- https://static.usrfiles.com/ugd/0cd3a8_c68d1dd3e3e64a60ac196c2b87d43ee2.pdf
- https://static.usrfiles.com/ugd/5ecadc_9fe672ecaf3b473b9efacf40f6f05199.pdf
- https://static.usrfiles.com/ugd/b77b08_45d757ec83f04e0a810a20cae4fbd2a9.pdf
- https://static.usrfiles.com/ugd/b8c837_4c2e045a93f94478b4936269a56ed123.pdf
- https://cdn.shopify.com/s/files/1/0433/2666/8952/files/benim_hocam_trke_2020.pdf
- https://cdn.shopify.com/s/files/1/0440/3780/0086/files/81201340692.pdf
- https://cdn.shopify.com/s/files/1/0433/4387/2150/files/96734609667.pdf
- https://cdn.shopify.com/s/files/1/0431/2494/9153/files/jifujijera.pdf
- https://cdn.shopify.com/s/files/1/0443/0407/2860/files/chamberlain_whisper_drive_manual.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_off00006fe3.bin` `4fd5b4c5c2fcd7b1032da7d04c402c6b3abd509e3acc807c0d35a49e39db1426`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FE3	5488 bytes
`font_01_sfnt_off0000828f.bin` `9e7aa3b3569ee91e338ca5a2e336366a2f9a7f29e8b38d954bcdda44c9ce3a1d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x828F	11128 bytes

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