Malicious PDF — malware analysis report

Static analysis result for SHA-256 772aa21f3fa9b29a…

MALICIOUS

PDF

53.6 KB Created: 2020-07-27 18:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 182844cc14afd3967246c7cc505100aa SHA-1: 26b25f65dd24051fecfc57ab724e49cf0050f2b9 SHA-256: 772aa21f3fa9b29a177634a327658d3fd17e91c335ca2e242baaa454521aafdd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

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/pify?keyword=adventure+of+tintin+game+apk
    • http://files.ccstudioinc.com/uploads/1/3/0/7/130775772/7363538.pdf
    • http://files.lavenderandleaves.com/uploads/1/3/1/4/131452817/b2ad10.pdf
    • http://files.federicabruni.com/uploads/1/3/1/3/131381919/195876.pdf
    • http://files.ailiniwan.com/uploads/1/3/1/4/131453919/fuzewilijoki-worisavufisite-rexara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/falubisudamak.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/84286832964.pdf
    • https://cdn.shopify.com/s/files/1/0433/2742/2632/files/luwarazapijojipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/najojeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/14700395247.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/toxata.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/sumotazunemutalumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/wevamukazuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/xusupolevuliminogolikeba.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7770/files/jarerijudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/95416088241.pdf
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/pijuvudoba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007200.bin
92af3c2d9db9758b70324d13fcc7d4eec65cf83e412b69b88a97272208e03911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7200 3192 bytes
font_01_sfnt_off00007d70.bin
68accb1e45bf013b927c3b485c3aecb4e000d1123f49c8690196059765efd9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D70 5148 bytes
font_02_sfnt_off00008ee3.bin
628b5dd3e4e838f6ccd3a9c4d0d2804cb22a76a6d1795cf0f2a9ba27169d1802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE3 10236 bytes
font_03_sfnt_off0000b230.bin
357f999a46d43fc8b12d51a464b1263942ba694969a686154d44496feaf0877d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 16468 bytes

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