PDF malware analysis — malicious · 52cff3e939d7c236

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 10:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f9809945ae83f769e4c7f1dfc87d2ee7 SHA-1: 61b1b20169a94cb7c007d83eaa10d3944aa84d28 SHA-256: 52cff3e939d7c2368feeb3a05273d4f791bf7e2d12ec10fdc950da13c2e82d27

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to `ttraff.ru` as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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=assimil+ingles+pdf+google+drive+audi
- https://static.usrfiles.com/ugd/158fb9_bfec35fb40444aef9b0ed51f69bf9444.pdf
- https://static.usrfiles.com/ugd/aef5b7_d6055b765d6d47aca3803ae12579ab18.pdf
- https://static.usrfiles.com/ugd/b8c837_b3c91d1cdd20489fab72408da3a639f5.pdf
- https://static.usrfiles.com/ugd/b8c837_eafe849da0914da69c03effc17f8b20e.pdf
- https://cdn.shopify.com/s/files/1/0433/9925/0072/files/guide_nutrition_sportive.pdf
- https://cdn.shopify.com/s/files/1/0450/7402/2550/files/practically_speaking_rothwell_free.pdf
- https://cdn.shopify.com/s/files/1/0428/0804/9830/files/39072119184.pdf
- https://cdn.shopify.com/s/files/1/0439/5512/6430/files/abnormal_psychology_ann_m_kring.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000049d1.bin` `3b292d52cd43ce786cf4d3a7cf7f199252c485c6bcc996a14cb8560b7a4527df`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x49D1	5412 bytes
`font_01_sfnt_off00005c1b.bin` `a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C1B	1800 bytes
`font_02_sfnt_off000064a8.bin` `a4f451106be7ac3297496f282b13152ec986f2ccdf575bc172dd51ee4b3e6814`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64A8	12992 bytes
`font_03_sfnt_off00008ce3.bin` `e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CE3	16204 bytes

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