Malicious PDF — malware analysis report

Static analysis result for SHA-256 1385152d0b642948…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 17:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51e1b5d2a6ca1d1939272cd5ebfbdfd SHA-1: a40b6d0a1e2f245b6720b31ee4b836e30cfa4dfd SHA-256: 1385152d0b642948399a2b79e79c323bcfc6de059d27a111a38c31eb1d3355a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=download+prorat+full+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading 'prorat' and lists numerous external PDF links, suggesting a link farm designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=download+prorat+full+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6fbb7c673101445893d7852fea85c092.pdf
    • https://static.usrfiles.com/ugd/078c79_3191d849e7874d16bfa4d4a69e89a2f7.pdf
    • https://static.usrfiles.com/ugd/405339_1ad52c9442e848a5a3e20d991d54b43a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3b8e362a2e4060896fd3ae632f73cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd1ec1c84f314526b26d0fd9f920fe46.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/35396618387.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/zojugebovojeveniwuzesamu.pdf
    • https://static.usrfiles.com/ugd/b8c837_451c69a7ab8d4a5fa28f1bf65de6d96e.pdf
    • https://static.usrfiles.com/ugd/0a593f_4ae262465f204916a33d6666bb8b3d7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_32a12841d5254b648acbf60ff0a1acdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_83f92be164bc406182a4d39472faeb79.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc25a47a265146d5aba92136afab4e3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_56c778c42d384d11aaec11678f32ac8f.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.

FilenameKindSourceSize
font_00_sfnt_off0000701a.bin
533d2346b831c6befe256b3f0434cd2d6ba35e8c99f8b0722a88f26d377ca385
pdf-font-stream PDF embedded font (sfnt) at offset 0x701A 4948 bytes
font_01_sfnt_off00008113.bin
787c5cf1f61f08e652a0acc3f406012bf24072a7f2c3e3a7a975003a6ba583e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8113 10640 bytes