Malicious PDF — malware analysis report

Static analysis result for SHA-256 75274d774c273924…

MALICIOUS

PDF

39.5 KB Created: 2020-08-19 12:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ae6117d90413d5ac75bca4372d90b55 SHA-1: 84c515132b0dde98364c4a7da3746979d41c3259 SHA-256: 75274d774c2739242b9c91a6fd0343d1009376bd597e0f8b1130f3c1b3b558f2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent URL, 'https://ttraff.ru/pify?keyword=animes+orion+apk+atualizado', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading potentially malicious APK files. The ML classifier 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.ru/pify?keyword=animes+orion+apk+atualizado
    • http://files.ndbackyardbirding.net/uploads/1/3/2/6/132682790/7146247.pdf
    • http://disulur.meridianhistoricalvillage.org/uploads/1/3/0/7/130739777/debomexazuk.pdf
    • http://files.silkwoodart.com/uploads/1/3/1/3/131383314/3911707.pdf
    • http://files.texasyouthjumpstart.com/uploads/1/3/0/7/130740221/c624eb00fdd5fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/51734532381.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/40843845153.pdf
    • https://cdn.shopify.com/s/files/1/0440/4455/0294/files/98479861680.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/siduwiwadubaresesibejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/kalozobeninafitiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/convert_into_word_document_free_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/xoveziwajawobizamorajogog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e6e.bin
10ef5517114bcbf5d4b26583470ea29e5e0f8788c1d20bc6ec57de44f69a0f44
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6E 5092 bytes
font_01_sfnt_off00005fa0.bin
927c20bb0c42864f31e8c119102a3fb1c29886dae391a56cd3d8c1756a8a4497
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA0 10556 bytes
font_02_sfnt_off00008360.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8360 4324 bytes