PDF malware analysis — malicious · bf2b1f19b50c5048

MALICIOUS

PDF

40.5 KB Created: 2020-08-29 08:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1d74d7d5c9966445d3404fd3793588c5 SHA-1: 1fdbfa141adf783d8186b0ad960616854d286de6 SHA-256: bf2b1f19b50c504892d3becd2eb2b14bbc5d9bc222739344d24126129b39ea5a

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious redirector URL is the primary indicator of compromise.

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.ru/wix?keyword=deductive+and+inductive+method+in+research
- https://static.usrfiles.com/ugd/b8c837_aeb2c51e61864088a723f52a2f679481.pdf
- https://static.usrfiles.com/ugd/b8c837_18669815a9c24adca17dfa537faffc0d.pdf
- https://static.usrfiles.com/ugd/b8c837_af6464475a5f4198af8e6c31fbcf5419.pdf
- https://static.usrfiles.com/ugd/b8c837_a5d7dc1cfffc4c32bd88f0a002258f45.pdf
- https://static.usrfiles.com/ugd/b8c837_2dc492b0b03549709b0c968f3d0f165c.pdf
- https://static.usrfiles.com/ugd/b8c837_5f600633f2ff4fc5b198964fd0905691.pdf
- https://cdn.shopify.com/s/files/1/0429/2254/1209/files/wedupe.pdf
- https://cdn.shopify.com/s/files/1/0433/7627/9702/files/79717800303.pdf
- https://cdn.shopify.com/s/files/1/0433/7526/3898/files/bevuzizugegowiriwe.pdf
- https://cdn.shopify.com/s/files/1/0431/5663/5805/files/ballade_no_3_chopin.pdf
- https://static.usrfiles.com/ugd/b8c837_73c01e9f6fc3485c9e71736f766de4b6.pdf
- https://static.usrfiles.com/ugd/b8c837_62ae193ace524fe9b034448db6ac1e87.pdf
- https://static.usrfiles.com/ugd/b8c837_a4503845d5b84f0ca63de83f4af63989.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_off00005f16.bin` `82540f8cf785f76bc9f9553341a05d5d83c1590706668bffde8653f1d600cc68`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F16	5208 bytes
`font_01_sfnt_off0000709b.bin` `7be2c68dd1e96ac11ab53ff41f955e0d0a40f677d9e0ce51ed97a4a1c02ccfa6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x709B	10816 bytes

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