Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cb5b31e4b4bec1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-03 12:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66c3371e431ae9ce75a136d56c6840be SHA-1: c25543125c1360cb5efda9cb03f8872e8908d1f6 SHA-256: 84cb5b31e4b4bec19c826f9a44d495d6604917e1e352bdae7a4281169869d6b7
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.ru/pify?keyword=oxford+handbook+of+clinical+pharmacology+pdf', is designed to trick users into downloading a file by impersonating a legitimate handbook. The document body, though heavily obfuscated, contains references to this lure and the redirector URL. The presence of numerous PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=oxford+handbook+of+clinical+pharmacology+pdf
    • http://files.adammilt.com/uploads/1/3/1/8/131871954/9287648.pdf
    • http://robage.homilytools.org/uploads/1/3/0/7/130775612/fujisoluw.pdf
    • http://files.andreab4me.com/uploads/1/3/2/6/132681832/tuluvefatirole.pdf
    • http://files.americanimmigrationpllc.com/uploads/1/3/1/1/131164473/8355548.pdf
    • http://files.lyndonleadershipconference.com/uploads/1/3/1/4/131453355/tasosupeda.pdf
    • https://cdn.shopify.com/s/files/1/0438/2539/7920/files/97038212132.pdf
    • https://cdn.shopify.com/s/files/1/0435/3877/6223/files/ce_200_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/saloxatuwanararaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/41618515598.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/prevent_macbook_from_sleeping.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/avery_8167_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/28484551606.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/32761445922.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/weganobetalumoxiduxer.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_off00005ecc.bin
ce75ea82e30a84608622bcf5f8af30edff53d172f02e2358538c4e5e9b29470c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECC 5792 bytes
font_01_sfnt_off0000725f.bin
69a9da4d43dfb2ab87f7257d637f3884088c2ec0a7f68f2da4377f48ae46076b
pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10056 bytes