PDF malware analysis — malicious · 1abd6852469c7304

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 05:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9cdd52b8217ceaf090e1f0f1ebe023e4 SHA-1: fb8c26cb1f76a0a0d43b8cac523ac443fac0ffb8 SHA-256: 1abd6852469c7304096d769120bd019d0bc0124ede612c6e78a2085e363ae494

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=ged+reading+practice+test+printable'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the lure text 'Ged reading practice test printable' and the malicious URL, reinforcing the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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.ru/wix?keyword=ged+reading+practice+test+printable
- https://static.usrfiles.com/ugd/b8c837_3d8d25558c324058b98cf572a12700a8.pdf
- https://static.usrfiles.com/ugd/93971e_01bb7fe02b3e4e6a9cf8e5dfdd642986.pdf
- https://static.usrfiles.com/ugd/45e30f_34c3fa964f97427f8a0f3ab3d69cd6c9.pdf
- https://static.usrfiles.com/ugd/b8c837_324eabb27b67418593593c50426704ce.pdf
- https://static.usrfiles.com/ugd/ce14f3_94085a8569b846e89517bee01b9449f0.pdf
- https://static.usrfiles.com/ugd/764aaa_1e9bae4ffbcb47c2a2415511c69be426.pdf
- https://static.usrfiles.com/ugd/9ec29b_34b721df36494a13ab4901f685195cfb.pdf
- https://static.usrfiles.com/ugd/f46427_ac1c321f104f461ab5b4edc983e83922.pdf
- https://static.usrfiles.com/ugd/b8c837_557042824bb64950b51f14f45456db10.pdf
- https://static.usrfiles.com/ugd/5360f8_3db98a74249a48268292db646eb67d87.pdf
- https://static.usrfiles.com/ugd/80bfa9_c9a25301217f44daa1f9a330b08a09f5.pdf
- https://cdn.shopify.com/s/files/1/0430/3775/3493/files/wiki_definicion_diccionario.pdf
- https://cdn.shopify.com/s/files/1/0431/0741/8273/files/barbie_hair_styler_games.pdf
- https://cdn.shopify.com/s/files/1/0453/9642/6920/files/bulewajurimatitikofi.pdf
- https://cdn.shopify.com/s/files/1/0431/5286/7477/files/donidonerina.pdf
- https://cdn.shopify.com/s/files/1/0438/0485/2386/files/famonivadenojodutoje.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_off00006a31.bin` `52dd1f6bdc2b39848af89fcd9a0448e8bbd13b54b0d918800d7b5f8e7e785bde`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A31	5412 bytes
`font_01_sfnt_off00007ca1.bin` `6fde2d5c331ef94511f8c528ec8ed96115cf388aa2e9827be0d83f4f8958fb48`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7CA1	10480 bytes

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