Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd1938dce440ff3…

MALICIOUS

PDF

105.5 KB Created: 2020-08-09 19:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2607426f8a9a27796eb7702533f98e4b SHA-1: b3938080b9a0d2ea872c0c83c31d50422cea019d SHA-256: 8fd1938dce440ff3a3b780dba79e7325731ae46ba353c217bc46efc3d76fa901
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.cc/pify?keyword=spreadsheet+application+in+business+pdf' is likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to spreadsheet applications and business contexts, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=spreadsheet+application+in+business+pdf
    • http://burufod.wingateroadrunners.com/uploads/1/3/1/3/131383791/4bedc079.pdf
    • http://gavuju.merlotembargo.com/uploads/1/3/2/6/132682883/zerumelusitulapujex.pdf
    • http://mugapel.freethingsforenglishteachers.com/uploads/1/3/1/6/131637136/1739b25f03.pdf
    • http://torura.stlcreativecave.com/uploads/1/3/0/8/130873826/12fc3a.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/sifan.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/10455244514.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/attestation_sur_l_honneur_exemple.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/wagunefek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/capacitor_value_table.pdf
    • https://cdn.shopify.com/s/files/1/0437/6274/5501/files/91277013462.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/vikibozonorozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/bonesetter_s_daughter.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/vumetuputo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/71305661896.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/fojidapafonisor.pdf
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/lalopufaseravoburuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/ielts_academic_reading_practice_test_2020.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_off00015367.bin
ab0ddd13451357116faa3270045691d4c26e1fcb50f6adc869ad13e713c3fa01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15367 5488 bytes
font_01_sfnt_off00016600.bin
47bc02fc1468906f721611b7e81b6d8c170e10834a87d45a65972171b358cc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16600 15916 bytes

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