PDF malware analysis — malicious · f08e90cce3319d53

MALICIOUS

PDF

45.2 KB Created: 2020-09-14 07:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cd738278a7f40cffc5936643ea1eb765 SHA-1: d2d720079beb9e091149e125ab2b2270bb18ae9d SHA-256: f08e90cce3319d53811d5c1bc040efcaa847c7a0ad1ffd7e1e9d1461b35d3294

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. While no scripts were extracted, the presence of the malicious redirector strongly suggests an intent to lure the user to a harmful destination.

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.link/wix?keyword=18th+century+letter+writing
- http://files.permittechnation.org/uploads/1/3/0/8/130813448/dosore.pdf
- http://files.roryfitzgeraldbledsoe.com/uploads/1/3/0/7/130775071/282610.pdf
- https://static.usrfiles.com/ugd/808d8c_fe3346a6d8914b4aa1acaab6e7db3e02.pdf
- https://static.usrfiles.com/ugd/defdb4_4e53083dc3f44524925b612de1cdf94d.pdf
- https://static.usrfiles.com/ugd/49488e_f3a4fce833ba46f1bb7b53a6bc101d44.pdf
- https://static.usrfiles.com/ugd/4cfbbd_834c3e5898e3429a8649f5c7f933621a.pdf
- https://static.usrfiles.com/ugd/2f7815_215f16afd380474ea44cd7b2e494b17f.pdf
- https://cdn.shopify.com/s/files/1/0434/3041/2453/files/pujubetijaja.pdf
- https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sedetifowakesefo.pdf
- https://cdn.shopify.com/s/files/1/0434/6455/6710/files/energa_y_concepto_de_materia.pdf
- https://static.usrfiles.com/ugd/50c35f_799790ed2eee410a933c92e97b84f9f6.pdf
- https://static.usrfiles.com/ugd/120f26_619035b891ee4209b56347f3c4c98f46.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_off0000738a.bin` `be265dee51fad33c888c05d01b2de5ee65ff79ae3d64b30cd5c73a4cdb3aa1a1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x738A	5020 bytes
`font_01_sfnt_off000084ba.bin` `c5781613d3dd85cf5414c8665528fd08cf5190be55b9f46846a2ce510a86b460`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x84BA	10456 bytes

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