Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddd890bf50b520e…

MALICIOUS

PDF

49.5 KB Created: 2020-08-14 09:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06be21e8e5a61102daaf1177db6b1513 SHA-1: 3b2bb5da3ae1c75f8daad615646b61137ac627ad SHA-256: 3ddd890bf50b520eb09dd971885a07cce3f32873e39eecb1a518f351de5c4cb8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL: https://ttraff.cc/pify?keyword=affirmative+tu+command+form+of+comer.

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=affirmative+tu+command+form+of+comer
    • http://files.en.msp-lawoffice.com/uploads/1/3/1/4/131406433/mobumikefe_sajupebugodow_vikapup.pdf
    • http://files.htradingpost.com/uploads/1/3/1/1/131163718/efdb086061.pdf
    • http://mitomida.thebloodcrowstories.com/uploads/1/3/1/1/131164250/suserepinonire-rutejifonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/94920617218.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/form_6401_usps.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/xeranevudemimamuvax.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/79714599677.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/59827074514.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/wigum.pdf
    • https://cdn.shopify.com/s/files/1/0449/4488/3880/files/wordly_wise_3000_book_7_lesson_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49181926903.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/knee_strengthening_exercises_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/11431830398.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/56564179679.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/download_os_x_10._11._4.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4903/files/pizadijinakurunefe.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/exploring_biology_in_the_laboratory.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_off000083eb.bin
ed8f7cf6a353a197df0c05389aa1e1cd924e04c08456e6778a63cab07727d173
pdf-font-stream PDF embedded font (sfnt) at offset 0x83EB 5004 bytes
font_01_sfnt_off000094d8.bin
2a8cbb8f64e6bc496a87b0af51b568e1b28314897e0b8a99f84605981423978c
pdf-font-stream PDF embedded font (sfnt) at offset 0x94D8 10816 bytes