Malicious PDF — malware analysis report

Static analysis result for SHA-256 713230970d3b681c…

MALICIOUS

PDF

61.6 KB Created: 2020-08-01 11:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9406d0c415e1e839dacf2f8c672f828a SHA-1: 578f5ce963a73f001131a7c9c7f6ef982376a42b SHA-256: 713230970d3b681cffd7a9181dbef7a56bc76d428593fc1a8df7e1588ee5a823
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. The ML classifier strongly indicates maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site for further exploitation.

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/pify?keyword=feels+like+temperature
    • http://files.cvgc1991.org/uploads/1/3/0/7/130776775/a4d4583bfcd0.pdf
    • http://files.maroevich.com/uploads/1/3/2/7/132712358/9beabf63c5.pdf
    • http://files.bareandpolished.com/uploads/1/3/0/7/130738921/fesujisagopivupas.pdf
    • http://files.tiffendentriplanes.com/uploads/1/3/2/6/132695679/c6aeceb83cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/9880/8224/files/valid_street_adress.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/8101727266.pdf
    • https://cdn.shopify.com/s/files/1/0437/9938/0130/files/zudixoderinazazamavopikil.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3432/files/vinokojamifafusajeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/xurupupuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/37367652109.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/vitimagaxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/gizulegugifipeguvigonam.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/13124016002.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/31833422624.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_off000099e4.bin
66d12e698ddc59c8206faa3eaa5ab4f980de6d3af0b830eda863ff311bb69ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E4 4652 bytes
font_01_sfnt_off0000a9a5.bin
9500fa69626e531f05fd704b04b8e7745581991a471d17964fc5c5992f2f8374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A5 16016 bytes
font_02_sfnt_off0000db20.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 4324 bytes

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