PDF malware analysis — malicious · 5c4084d707b4ce31

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 00:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 12a5aa9a7cbce69e57b8c98324ec1f73 SHA-1: 1eb30e458a5be1134729eb84abf834210b8a02f7 SHA-256: 5c4084d707b4ce31475e5ea6d0a9da5ca78792dd0721ea8b027568793e7837d2

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to medical terms and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.com/wix?keyword=pancreas+mass+icd+9
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_f23c293ec4514393949cf6601bb91e84.pdf
- https://static.usrfiles.com/ugd/217d68_870abed867734b32a5a385ae715fced5.pdf
- https://static.usrfiles.com/ugd/b8c837_92285239dda64af3bd69be43a5aa0015.pdf
- https://static.usrfiles.com/ugd/df73ab_b0e2231fa5c943bf81eece83c8171716.pdf
- https://static.usrfiles.com/ugd/bae363_5b534b37004c4825adaa0d1822039511.pdf
- https://static.usrfiles.com/ugd/de3d83_d43ac331b8cc4801a76e9614e778d898.pdf
- https://cdn.shopify.com/s/files/1/0435/2350/6336/files/6889559858.pdf
- https://cdn.shopify.com/s/files/1/0429/8424/3351/files/best_exposure_bracketing_android.pdf
- https://cdn.shopify.com/s/files/1/0434/6016/5797/files/zufuxiputema.pdf
- https://cdn.shopify.com/s/files/1/0455/4991/2229/files/xepemofepupaboxiporot.pdf
- https://cdn.shopify.com/s/files/1/0440/2656/0677/files/90512394399.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000065d6.bin` `5f533a59786003d8a8800b4df134ffd6cf91b8a48ccefccb73963d0fb700a3be`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65D6	5208 bytes
`font_01_sfnt_off00007767.bin` `20699ba60b62b634504cc4e4537adea50ef35c6cddd3c334859adbd80e758a67`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7767	9788 bytes

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