Malicious PDF — malware analysis report

Static analysis result for SHA-256 fede9c729d354ad2…

MALICIOUS

PDF

39.6 KB Created: 2020-08-22 03:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7f9846ef9a91132245e907da8b0928f SHA-1: 1492ecb884cca500d106caa7cebb1fad32847585 SHA-256: fede9c729d354ad29cf2c80b5698c290785686ee83a57b7ea27c7c2d3bc988c9
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 ttraff.com. The document body, though heavily obfuscated, contains a string that appears to be a lure for a 'pdf annotator android free' application, which is then followed by the malicious URL. The PDF also contains a large number of embedded links, many of which point to Shopify domains, likely as part of a link farm to improve SEO for the malicious redirector. 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.com/pify?keyword=pdf+annotator+android+free
    • http://files.littlepieceofmyheart.com/uploads/1/3/2/6/132681501/495c1.pdf
    • http://files.bawathitchurch.net/uploads/1/3/1/3/131380600/dadinebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/12284695979.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/pan_card_application_form_2020_latest.pdf
    • https://cdn.shopify.com/s/files/1/0432/4864/8354/files/wikovazizedisa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8886/files/anti_tpo_test_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/22454361260.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/zuzep.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/gijeminuribusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/english_grammar_tenses_in_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/vororebixofexejowagiret.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_off00005f67.bin
956cc692ff10f78cf976a4c3f755cbc71dfeac9057ab03857ead6f3ca77d7d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F67 4692 bytes
font_01_sfnt_off00006f66.bin
f49c40712c4759ccb498e167d922401bfa5a539e885721ea281a3b410c8d5914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 10016 bytes

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