Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3874c9b45ef9b58…

MALICIOUS

PDF

48.0 KB Created: 2020-07-25 23:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f0643a0c99b88236ffb18387e13f618 SHA-1: c3483d276f12ec1b2a8caa37da85979350d4ebf0 SHA-256: e3874c9b45ef9b581de9b851b543b51ab671d3bcf0a0aed0dcff53ba978feb3d
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous links, identified as a PDF link farm, with one critical heuristic firing indicating a redirect to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'free templates borders frames'. The presence of a visual download button heuristic further supports a social engineering attack. The primary malicious IOC is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+templates+borders+frames
    • http://files.austinasphaltpaving.com/uploads/1/3/2/6/132682039/3009199.pdf
    • http://files.delrayvillasplat2.com/uploads/1/3/0/9/130970003/kevuzasipas_ximugosuk_sujoj_womagud.pdf
    • http://files.limberlostmusic.com/uploads/1/3/1/4/131437680/be11f04a437d.pdf
    • http://files.9td.org/uploads/1/3/2/7/132740511/kajoxeraxejegoke.pdf
    • http://files.canalsigling.com/uploads/1/3/1/3/131383018/8717392.pdf
    • http://files.canalsigling.com/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0432/7967/9646/files/samipimonakorufemomigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/dimaloperajobisavojopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/natepuwitis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/sarikajopudepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/40059924761.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/lajemeturaxulefopa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/repanamidesowidilanobir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/jevefawezopotogubaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/kixebudogarefaladojorox.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/73430726414.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19490865332.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_off00007730.bin
0c1341ce114c45399bb580a105a50169e52649d2501ec7bbae13cd56412d9045
pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 4916 bytes
font_01_sfnt_off000087dc.bin
792f7fa5bc5bd6c50284b38c4e18764c9f302636f1a574b605694cc0b369852a
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 13300 bytes