Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0454c7adb0d8767…

MALICIOUS

PDF

32.1 KB Created: 2020-08-15 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0fee708b2b2266eafd7255b88b23e75 SHA-1: f34b804937adc0cb6d0287577e6abfcaf5b2c4bb SHA-256: f0454c7adb0d876742a42a9fa3117923e54bda3d7d6c69b933b9833484580057
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, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=convertible+dress+style+guide', is designed to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, some of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the redirector and the link farm suggests a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=convertible+dress+style+guide
    • http://files.certifiedpipeservice.com/uploads/1/3/1/3/131383251/zoralafivadupa_kogon_nudiraja_sedisuveduso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2375/3635/files/situnesibusepafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/automatic_stirrup_bending_machine.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/galepejalupelem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/raspberry_pi_mount_usb_drive_automatically.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/87679332488.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/zubibozobazukome.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/multiplication_worksheets_printable.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_off0000410e.bin
c53a0760c5c0f5721838540e870813068ae35ae43b2ea5891b60e17af0132a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x410E 4988 bytes
font_01_sfnt_off0000521b.bin
22138694367d464cd31b2081a052bff21d2793c59c2afcd810dbc27f97087e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x521B 10072 bytes

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