Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0ee3ac01a6bb3a…

MALICIOUS

PDF

55.2 KB Created: 2020-08-11 15:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf20b25b97d72465c7b2d5b6ec42365c SHA-1: dbebc5f74829cf9e71a6255aec4e4cc42b7dfce9 SHA-256: 1b0ee3ac01a6bb3af0e8d79e333076a40176b24d5054b831025df5d9c15a5093
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/pify?keyword=criminal+law+notes+pdf+kenya'. This URL is presented within the document body, disguised as a link to 'Criminal law notes pdf kenya'. The PDF also contains a large number of external links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or traffic redirection. 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=criminal+law+notes+pdf+kenya
    • http://files.atelei.com/uploads/1/3/1/3/131398059/51e168e389130.pdf
    • http://lujubivi.karenrhebergen.net/uploads/1/3/2/8/132816066/tojisob.pdf
    • http://files.wtfmir.shop/uploads/1/3/1/3/131383318/xexaxizidomag.pdf
    • http://files.sassypolkadots.com/uploads/1/3/0/9/130968988/domivojajirif-lemikexel-xuboguvup.pdf
    • http://files.marshallconservatory.com/uploads/1/3/0/8/130815026/1484123.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/earthquake_auger_parts.pdf
    • https://cdn.shopify.com/s/files/1/0431/0817/1925/files/7955961585.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/15982305381.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/25149100748.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/amleto_william_shakespeare.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/free_math_worksheets_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1293/files/91749429277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jivanup.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/fizitijobiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/jemabenutawizifugawukufen.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/88890258632.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/xadixasanabadivotikofuxan.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_off00009add.bin
8d115ccb39c01d78aa30dca81cb806452fce6239c0d4d8adc8e7846f10a08ee1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ADD 5352 bytes
font_01_sfnt_off0000ad0a.bin
4ab656ce282cc270e015b52ad8f6dd47ea10429e98aff8eaef0b5a9e892623ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0A 10144 bytes