PDF malware analysis — malicious · c9fb3f4a8aa8bdeb

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 21:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 18e5253e6aa6b5ca6ba291b8166870fb SHA-1: b979f9b4bf3add217946bcb87e25ea61937bf182 SHA-256: c9fb3f4a8aa8bdeb3d5d923e0beff3a613ab7527ddb33f45be97e09dca83fe53

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=ios+for+android'. This URL is likely used to redirect users to malicious content. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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=ios+for+android
- https://static.usrfiles.com/ugd/8de238_564c3e2aa29341d2a1fe6e30b3f3a24a.pdf
- https://static.usrfiles.com/ugd/b8c837_78649abb3d80431f8a9bf0224a081a4f.pdf
- https://static.usrfiles.com/ugd/1f5cef_648b5a4a6659450aa298bce5f4092774.pdf
- https://cdn.shopify.com/s/files/1/0433/4921/3349/files/titarerusozek.pdf
- https://cdn.shopify.com/s/files/1/0428/2574/4540/files/aarti_laxmi_mata_ki.pdf
- https://static.usrfiles.com/ugd/b8c837_6de06d3b573048e3a1efb3c1268c79d1.pdf
- https://static.usrfiles.com/ugd/b8c837_f04ff70ac2c7404db8eb1046660cbc7d.pdf
- https://static.usrfiles.com/ugd/b8c837_a7fadb65aeb4427399ac672edb860eb2.pdf
- https://static.usrfiles.com/ugd/3f80ec_6bd8ffa89800458aa637dd5e0d7f24c7.pdf
- https://static.usrfiles.com/ugd/b8c837_c8f3a609357f4cad8cd73ce7ccf1bb69.pdf
- https://static.usrfiles.com/ugd/b8c837_685f764df56043f5906e98e4183beb37.pdf
- https://static.usrfiles.com/ugd/0df15e_8b26bc2ea0f24edeb0d2de3ad274b9e8.pdf
- https://static.usrfiles.com/ugd/e745be_9a0a40fd70084014b4842a786494b20a.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_off00006446.bin` `2d4abbf6e1046da19649b7c9c04f4dd402064b2230b4b940d6f2f29491c49227`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6446	4804 bytes
`font_01_sfnt_off0000749f.bin` `72d4ab5e96f4df357924f78f7a938c342c641f364e6929f912da7e4519fea314`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x749F	10480 bytes

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