PDF malware analysis — malicious · 748431809ce56b19

MALICIOUS

PDF

44.3 KB Created: 2020-08-29 10:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 86b1bf335f2dfd2beab4086829a2ee07 SHA-1: 336c116c20638fa274eaa9cc2458c200d8a40b69 SHA-256: 748431809ce56b19ad9e882b51089a20dbbc07c6d39aa749c5703be2fdb8639a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded URLs, with one identified as a malicious redirector. The document body text, though heavily obfuscated, includes the target URL and a plausible lure related to 'berklee ear training pdf'. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted from this sample.

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.ru/wix?keyword=berklee+ear+training+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0461/1355/4596/files/5e_druid_circle_of_the_land.pdf
- https://cdn.shopify.com/s/files/1/0428/8158/1209/files/turag.pdf
- https://cdn.shopify.com/s/files/1/0433/7483/7923/files/35945592687.pdf
- https://static.usrfiles.com/ugd/b8c837_d771a117df0c467e8870d4fd291b8aa6.pdf
- https://static.usrfiles.com/ugd/b8c837_c2a34f99e45c4631a1cac9d382272220.pdf
- https://static.usrfiles.com/ugd/b8c837_4100a99324054c1783948dde4ecb7c1a.pdf
- https://static.usrfiles.com/ugd/b8c837_7ab2735ed65648c4a259943546cac86a.pdf
- https://static.usrfiles.com/ugd/b8c837_6a79308ff87841ee929654efaa6f921e.pdf
- https://static.usrfiles.com/ugd/b8c837_8731ca8a8b6c45afb1c21e8d644fb998.pdf
- https://static.usrfiles.com/ugd/b8c837_9917e18e7d0143e69e14cd82f8205fd7.pdf
- https://cdn.shopify.com/s/files/1/0428/2066/5510/files/jipuzezote.pdf
- https://cdn.shopify.com/s/files/1/0433/9875/8557/files/57891752466.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_off00006699.bin` `138a352ac5468d8ec03d62643e0b23a4a2a7197e109c4f45f7a9eafe652ebd3f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6699	5144 bytes
`font_01_sfnt_off00007829.bin` `d94bf7e05b0fd24379b11d19776bb1ab0df61b01ae5156df554260b27d1804f6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7829	14272 bytes

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