PDF malware analysis — malicious · d77cf5576535f7ba

MALICIOUS

PDF

39.7 KB Created: 2020-09-03 14:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f32d541ecb068fc715adec0a3f75cd79 SHA-1: c36ec6d0c620bbb7fe79f9f4d41b77e28bcabac8 SHA-256: d77cf5576535f7ba38d5a398d71ea3ab40b62d77293188b551f114397037bcef

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded links that point to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'free falling bodies worksheet' and includes the malicious URL, suggesting a social engineering lure. The presence of a large number of external PDF links also indicates a link farm, likely for SEO poisoning or to distribute further malicious content.

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/wix?keyword=free+falling+bodies+worksheet
- https://static.usrfiles.com/ugd/665c20_ca6d7bec8d504a65ad5d0d0266f2fbcc.pdf
- https://static.usrfiles.com/ugd/69695d_f642e33f8a3742ee80e806dd4a626f79.pdf
- https://static.usrfiles.com/ugd/13ae68_334bb35f554c4b2bb4f323962a4b9c81.pdf
- https://static.usrfiles.com/ugd/f5a024_32008291ce1a4fe4bf786c8815f2f761.pdf
- https://static.usrfiles.com/ugd/b8c837_2010f912381441b5922af6398d0e7fb7.pdf
- https://static.usrfiles.com/ugd/9d869b_0f4d8cca545b41fbacd6421fe1a74140.pdf
- https://static.usrfiles.com/ugd/c75f60_7f842cef983149dc911c2a8fb0f73a7f.pdf
- https://static.usrfiles.com/ugd/b8c837_6c308b80a8334f6cbbac0840859dd934.pdf
- https://static.usrfiles.com/ugd/c0a468_3436d45c5247474e81608004a43ba4b5.pdf
- https://static.usrfiles.com/ugd/ce14f3_3f20b9ba81ee48a9a64626108772dae3.pdf
- https://static.usrfiles.com/ugd/49be48_5db384babe214045961cf5e0e591ba99.pdf
- https://static.usrfiles.com/ugd/6d59ab_0ac817d6be214ac3ae8ed9e3f09bd28a.pdf
- https://static.usrfiles.com/ugd/a4e402_48d6bc843ea244d0813a8f5191e9d245.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_off00005d2f.bin` `b0e0a4a925dec96d8ac9faf64834795c70d827c11f995666e3c0a723daa6bd5e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D2F	5420 bytes
`font_01_sfnt_off00006fa6.bin` `85d9d5b018d812559b8cc33ada0a58ce6f54b3d5ef431f1efb86387065051590`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FA6	10120 bytes

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