Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbca535fc7466fe…

MALICIOUS

PDF

57.0 KB Created: 2020-09-03 00:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a754624f143ee5abb1167e1c3ad2127b SHA-1: e1410a0b99b7bcc61b0fe45af56a6aa409b6c6db SHA-256: 3cbca535fc7466fea4925fa62cc14521706a1258a155b8a1f5272a6112ab7bd1
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=crystal+reports+developer+edition+for+visual+studio'. This URL is presented to the user as a download for 'crystal reports developer edition for visual studio', indicating a social engineering lure. The PDF also contains a mass external PDF link farm, suggesting a SEO poisoning or link farm tactic. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=crystal+reports+developer+edition+for+visual+studio
    • https://static.usrfiles.com/ugd/576447_3c1c8037a5bc46ba9eba6dbbdc4738c8.pdf
    • https://static.usrfiles.com/ugd/a891c0_031b9e0387a34d65891380ef4452d858.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5751e6bda844f2b8fa809d0d9be069e.pdf
    • https://static.usrfiles.com/ugd/b8c837_519a12aecb254681bb21775f6fe016f4.pdf
    • https://cdn.shopify.com/s/files/1/0461/7587/9322/files/english_grammar_proficiency_test_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/18946693843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/mannarkkad_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93867881616.pdf
    • https://cdn.shopify.com/s/files/1/0434/8932/9312/files/45049341584.pdf
    • https://cdn.shopify.com/s/files/1/0447/7878/2869/files/95877626183.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/passive_voice_exercises_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/balance_sheet_account_format_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/because_of_bethlehem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000709b.bin
cdadd776d1ff4164fd76d74ac531fca88b687dcca75bf0bc1752f903312fa029
pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 13316 bytes
font_01_sfnt_off00009bf9.bin
e290af4b255f8e66154220c8ca93eaf6941d8b4e76f0cc91cec37af87802cb6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF9 5104 bytes
font_02_sfnt_off0000ad70.bin
7933cc4af20a797750931116f168a33168371b4d78f2c5697ea4e1f55343c661
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD70 12676 bytes