PDF malware analysis — malicious · 3f172db5122640d3

MALICIOUS

PDF

46.1 KB Created: 2020-09-13 23:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1ba4367eed58b2cab9a7059629a59f9e SHA-1: 5c1dfd968acf5a960e4a68dacc09c8e972626d36 SHA-256: 3f172db5122640d3096ac0c5b2d9f7924e52df0afb5bcd1e8c27ff28f3c8b018

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.me', identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'homeowners association audit guide'. The presence of numerous external PDF links, many hosted on 'static.usrfiles.com', indicates a link farm strategy, likely to obscure the ultimate malicious destination or to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=homeowners+association+audit+guide
- https://static.usrfiles.com/ugd/0d9a50_c90ed3f3d1184e85b04a5974224b8b86.pdf
- https://static.usrfiles.com/ugd/b8c837_e80f3863e9394ff49499568e03ae0785.pdf
- https://static.usrfiles.com/ugd/1c8c1e_c8f55870d6b741a9aefc7f0d4fa64ca0.pdf
- https://cdn.shopify.com/s/files/1/0430/8487/3879/files/91342965846.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
- https://static.usrfiles.com/ugd/05301a_f0aeb701351f43ed884da388c07b0ca2.pdf
- https://static.usrfiles.com/ugd/544e7e_8a275b439f28445599dbe12497b643b0.pdf
- https://static.usrfiles.com/ugd/0789d5_4d844312b469440e9ac490b472c7b007.pdf
- https://static.usrfiles.com/ugd/ab63e3_df5b2af65fc142128d5e5c3710e110eb.pdf
- https://static.usrfiles.com/ugd/dba42a_858c0c59d12d4c77b8f06f4750bb53c9.pdf
- https://static.usrfiles.com/ugd/a421e3_829338b4de3744edabe0d4d29e1ec031.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_off0000752e.bin` `af39b802ea128f8bde78e71886b8c860f9f9eb7b11712496443c5b02524bab36`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x752E	5280 bytes
`font_01_sfnt_off00008717.bin` `b8108139a086942f0811815489d938a8f8eedaa015431859d311b7d4013adedd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8717	10944 bytes

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