PDF malware analysis — malicious · a8ff2360dedd57bc

MALICIOUS

PDF

38.3 KB Created: 2020-09-01 01:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d63e071d600e30e6dccd8b63280000d1 SHA-1: b2e76e51ca23d5cba1c52e06bdd321b0e14eb26e SHA-256: a8ff2360dedd57bce2bebc4ee8cff886902f41e892f651fa0aab1ab5cf1fd3b3

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.com/wix?keyword=a+r+f+ka+full+form', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The presence of a large link farm further supports the attack pattern of redirecting users to potentially harmful 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.com/wix?keyword=a+r+f+ka+full+form
- https://static.usrfiles.com/ugd/b8c837_afbd93ee4301402d84b82ea47b436e8b.pdf
- https://static.usrfiles.com/ugd/b7ed05_df614ea63fad4dadb5ac43faf2399ba1.pdf
- https://static.usrfiles.com/ugd/739437_269ed366a3d3428ca6290144915ee1da.pdf
- https://static.usrfiles.com/ugd/b8c837_8e1ecfd8a23547dbbe145f2aad271d81.pdf
- https://static.usrfiles.com/ugd/764aaa_ab64200bb4504e4ea88d73226a10e406.pdf
- https://cdn.shopify.com/s/files/1/0434/7861/4168/files/wetujazatobapusa.pdf
- https://cdn.shopify.com/s/files/1/0428/9904/6553/files/bantu_education_act_interview.pdf
- https://static.usrfiles.com/ugd/b8c837_bddf7b4514c247c1be2646bd05302187.pdf
- https://static.usrfiles.com/ugd/08fe48_77e0c678aef34b5c840aa16af47d28f2.pdf
- https://static.usrfiles.com/ugd/33a16d_f7fdfedb09da411cbbd0c93bae7412c6.pdf
- https://static.usrfiles.com/ugd/55f640_221d6860dd9841babea7ad767425b7bb.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_off00005938.bin` `281bb6fbe0a708248a7b6a764d19a5d64f968ad01e9add5ba9735bc33439aa09`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5938	4788 bytes
`font_01_sfnt_off0000696f.bin` `e4adda78fb2bafb5ab02c9aaa00afccd81c47a919ca044074d0e034c9598fa5e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x696F	10436 bytes

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