Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fa8fde01f01c55…

MALICIOUS

PDF

47.0 KB Created: 2020-07-09 07:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb49aff896b1c498d966c145fda50282 SHA-1: 20976f165808bb48050a93c24b6606c24df0c110 SHA-256: c3fa8fde01f01c5564ba87158ad97f4c83e68412f004879df7f1612e52a881bf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to external sites. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure. The primary intent appears to be to drive traffic to these malicious sites, likely for phishing or malware distribution.

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.cc/wb?keyword=scoresheet%20baseball%20pdf
    • http://files.heyocc.com/uploads/1/3/1/8/131856518/rawowajesanepu.pdf
    • http://files.chainofeventsbw.com/uploads/1/3/0/7/130775138/3054939.pdf
    • http://files.stephaniejanaina.com/uploads/1/3/0/8/130874495/kovizobulobatet.pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdf
    • http://files.billanderton.uk/uploads/1/3/2/6/132680994/kigevisolixoba_lupuwadeson.pdf
    • http://files.raggedmountainrunning.com/uploads/1/3/1/0/131070098/4796002.pdf
    • http://files.open-insurrection.com/uploads/1/3/1/6/131607374/banagumitowoted.pdf
    • http://files.dear-travels.com/uploads/1/3/0/8/130814007/sivafipetexexub-sibilajeko-rulelodut.pdf
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdf
    • https://takekidelof.files.wordpress.com/2020/06/pixanidumikuzedewidap.pdf
    • https://xizabetone.files.wordpress.com/2020/06/80672844689.pdf
    • https://wetirub.files.wordpress.com/2020/06/67496861342.pdf
    • https://vonewoxad.files.wordpress.com/2020/06/kenokulaxipalu.pdf
    • https://povunefuw.files.wordpress.com/2020/07/nutunivedi.pdf
    • https://vajozix.files.wordpress.com/2020/06/81361975461.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a4e.bin
34a93346630da8f32ef83592ba4cbc07a645ec4ddabcf63c612ef76f2d98a64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4E 5120 bytes
font_01_sfnt_off00008bba.bin
49c216a51a366e401edb8ac36fb442b97aef3e56e7e50f8fafdcab9a5bc117fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBA 10328 bytes

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