Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe55a9cc23d42f6…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 00:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4609ad5667a3b764c81b4dd28bcb224 SHA-1: 4c0959ee021de3865609f6c635e0f31ddd2d0d8c SHA-256: afe55a9cc23d42f6c97320ab5e0129df59a8ff4aba4f72cd6a48b5962255ba2c
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links points to a known malicious redirector, ttraff.com, which is likely used to direct users to further malicious content. The document body, though heavily obfuscated, contains text related to downloading an APK and also includes the malicious URL, reinforcing the lure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic.

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.com/wix?keyword=baixar+facebook+transparente+apk
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/wasiluwotifedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/xiboxibaxojebuvanorunupa.pdf
    • https://cdn.shopify.com/s/files/1/0457/0808/3356/files/update_android_samsung_s7_edge.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/zigulivovakefigu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7846/5176/files/timawonifavefexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/car_amplifier_repair_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/10586497248.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/lukomer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/tediforakigodinifubabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1878/files/6150009561.pdf
    • https://cdn.shopify.com/s/files/1/0432/1692/8923/files/arriba_6th_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/xizeliwe.pdf
    • https://static.usrfiles.com/ugd/c068f8_fecce972758b4d7c8f447a396de572db.pdf
    • https://static.usrfiles.com/ugd/9e41f0_1ed7b69e6bf0430d9311948333ac2d72.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_off00005eea.bin
77a4a4e5d7f0c164fc6d27bb9d3cf5ff784f15e8eddbac36aa1872acf6ff018b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEA 5296 bytes
font_01_sfnt_off00007106.bin
5e452f7d20ff924b7546600f18b629b95de7ca886d370a55cbaf0dbc69539171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7106 10256 bytes

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