Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4b30f1b25f635…

MALICIOUS

PDF

119.7 KB Created: 2020-08-24 15:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a48f3780bee86dc017939e90a67df69b SHA-1: e381685a0c9853db03a112090b9d05f8f149e4a1 SHA-256: dcb4b30f1b25f63534ff250a5716553359f17f7df9bc8f026a4f224c6141b1f6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=oli+concealed+cistern+installation+guide'. This URL is presented within the document body, disguised as an installation guide. The presence of a link farm heuristic further suggests malicious intent, likely to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 3

  • 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.
  • 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=oli+concealed+cistern+installation+guide
    • http://files.stmaryscountygardenclub.com/uploads/1/3/0/7/130739070/kanixumogizedusoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/12602787197.pdf
    • https://cdn.shopify.com/s/files/1/0457/5697/3220/files/jordan_canonical_form_calculator_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/xesije.pdf
    • https://cdn.shopify.com/s/files/1/0439/5751/8494/files/alphabet_chart_printable.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/upsee_syllabus_for_b._tech.pdf
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/sofodubarewatozubudumuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/49503296140.pdf
    • https://cdn.shopify.com/s/files/1/0431/4693/6482/files/zekibuvileg.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_off00018d48.bin
6f59c37cc94a5e1aa0872ff74e5629d8015883bf14d95e24fb7d63f353ce337a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D48 5132 bytes
font_01_sfnt_off00019ebe.bin
0f4dde15c54b6f69c3d850a876218dbc0916bde811b5c2c7bd67d9af3a7043ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19EBE 16704 bytes

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