Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9b05be30f17e52…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 12:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974b4a2183cca7b814bb0c79337aad5b SHA-1: 96220c9defbf9f38e7592e1ea8dfb4941d9fa377 SHA-256: 5c9b05be30f17e52a01f7ea5775e147d9c305d5056a80bf29078d9030afb891f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, containing numerous external PDF links. One of these links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=bus+parking+game++uptodown
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9041/9616/files/samsung_j710fn_bootloader_file.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/mapa_catastral_de_puerto_rico.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/15269071038.pdf
    • https://static.usrfiles.com/ugd/b8c837_86529403d23d4fd38e9b14018a7b77cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc759c359be643d1a5467d6609002bdf.pdf
    • https://static.usrfiles.com/ugd/6f58fb_c4b20db180e349b6ae05d184a4808db3.pdf
    • https://static.usrfiles.com/ugd/3eed2b_c84eeb0cbf4443128e8b86fd7f1b7462.pdf
    • https://static.usrfiles.com/ugd/b8c837_41934b2beee5442ca25610b90fd6c930.pdf
    • https://static.usrfiles.com/ugd/493135_4105351517a24fb984267d1294fb278f.pdf
    • https://static.usrfiles.com/ugd/b8c837_74d49489ccae40119cda99f384d04bb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f42116102f64ca3866508ef0553202b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000502b.bin
b205604d45be764bd29eaa186b20c4e1a9654c0cbd3e704a4aee1290e921f436
pdf-font-stream PDF embedded font (sfnt) at offset 0x502B 5452 bytes
font_01_sfnt_off000062b5.bin
50a6ce5c20b6fa1f4ad92c02d228c6307d3f1271fa812f9a6865e68fd7043537
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B5 9572 bytes
font_02_sfnt_off000083c0.bin
e0cff7eadfaa2081e735adee93cc24c5603768d6c2c5dce4634a86644c9929ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C0 18460 bytes