Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbffe77b1a64f59c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 06:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c961e972e26af2731d65bac4843d389 SHA-1: 242461e99da7531edbacafac863873c828dac007 SHA-256: bbffe77b1a64f59c9ff41a77deeba41e4790b0df6c5362181e4e1decb1bd820c
120 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=cart%25C3%25A3o+de+cnpj+em+pdf', which is likely used to direct users to malicious sites. The document body, though partially corrupted, also contains this URL, reinforcing its role in the attack. The presence of numerous other PDF links suggests a link farm or a broad distribution attempt.

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.cc/pify?keyword=cart%25C3%25A3o+de+cnpj+em+pdf
    • http://files.chrispearceramwell.com/uploads/1/3/1/4/131407692/7614935.pdf
    • http://files.akpsiasu.com/uploads/1/3/2/7/132740905/82cf1a50afa662.pdf
    • http://files.2ourhealth.net/uploads/1/3/1/4/131453592/gavavimaripibalu.pdf
    • http://files.vacanzeitaliane.net/uploads/1/3/1/3/131398286/301bd0.pdf
    • http://kobemus.mybellaboop.com/uploads/1/3/1/4/131407164/bufaxatudorenej-dobuf-xevikovapenoxim-zidopozimufutar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/41029739992.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25618010541.pdf
    • https://cdn.shopify.com/s/files/1/0435/9025/4749/files/bitmap_to_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7517/3529/files/abertura_dragon_ball_gt_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/xejulotolimaniwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/exponents_in_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/77431739658.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_off000057b1.bin
b54c761e0b0c98f15b301683fc07ba95a8fb61fc3b544177ff7f159c3392e9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B1 5392 bytes
font_01_sfnt_off00006965.bin
4820f4b42ccb0cc59cb376b54af1c2b6ebe0495e60c087393121f8cfcbe74928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6965 12440 bytes

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