Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84a81ce7fa599c0…

MALICIOUS

PDF

58.5 KB Created: 2020-08-04 00:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1602c6653c671897d15fe1318f06d34 SHA-1: 0326e9d02c32b06c3a3a0e10d9a8f253cfaa1590 SHA-256: a84a81ce7fa599c0f67e64baba210f179f5a64989b47cdcd062e1e632c761813
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirect URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a spam or phishing campaign. The ML classifier also 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/pify?keyword=ielts+academic+writing+task+1+sample+questions+pdf
    • http://files.tiffanycrowhurst.com/uploads/1/3/0/7/130775867/timinalowufobej-bixosujejenid.pdf
    • http://files.annekawalker.com/uploads/1/3/0/8/130813314/mutusudulomol.pdf
    • http://files.comitalenational.com/uploads/1/3/1/3/131380720/bec3903d9201a6.pdf
    • http://files.annekawalker.com/uploads/
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/43612045397.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/62038152055.pdf
    • https://cdn.shopify.com/s/files/1/0438/4374/7990/files/fudumawowikesubafanuta.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/shooting_guard_drills.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/nidujufopejuzexoja.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/bepekomagevelevunup.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/90861287615.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/8400832158.pdf
    • https://cdn.shopify.com/s/files/1/0433/3499/2025/files/11th_zoology_practical_book_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/zeroruzotogatumolenunos.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_off000087a9.bin
3b2e5a89e82297fae378fd4f9312c4eac701bf469b98ed9d58fa01b5b2a4d9e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x87A9 5748 bytes
font_01_sfnt_off00009b38.bin
d3f70d2bded04840b5011d7cb47125e71e85f29f950815fa18392466cd4dbfc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B38 17328 bytes
font_02_sfnt_off0000c74b.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 16068 bytes