Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0056d46867b0c1…

MALICIOUS

PDF

39.3 KB Created: 2020-09-15 00:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e7034f3038b95fe0703464205d4b7f SHA-1: a79a744291092de3df4f917423e1bc54faa227db SHA-256: 9c0056d46867b0c172955ee8331eb69873abb198d716de392f97a000289bc5f7
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with several URLs pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.me/pify?keyword=endothermic+vs+exothermic+worksheet+middle+school, which is part of a redirector chain. The document body, though heavily obfuscated, contains a reference to the same worksheet topic, suggesting a lure to engage the user. The ML classifier also flagged this PDF with high confidence.

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.me/pify?keyword=endothermic+vs+exothermic+worksheet+middle+school
    • http://files.tuksnackpack.com/uploads/1/3/2/8/132814119/3037865.pdf
    • http://files.zoehounta.com/uploads/1/3/1/4/131437283/pixanakom_waruzi_nonepogar.pdf
    • http://files.kyopa.net/uploads/1/3/1/4/131482915/peluzofowusom.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_1ca90e50b2c340ec81db44b447d4aecd.pdf
    • https://static.usrfiles.com/ugd/1479de_0995f09ce40b46af9c12cfd7ba02e529.pdf
    • https://cdn.shopify.com/s/files/1/0468/0427/1253/files/bufamuwupezulikifabuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/gazalowenuzug.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0168/files/causes_of_atlantic_slave_trade.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/juzop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6392/6174/files/xinupamalolisarazixokom.pdf
    • https://cdn.shopify.com/s/files/1/0438/2552/8989/files/xapotixiwibozixozimebebij.pdf
    • https://cdn.shopify.com/s/files/1/0480/0492/3543/files/sony_str_dh800_manual.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_off00004f6b.bin
b9d5755fdbbc51c3209bccec1e8c83a6b1ee4ba313271f2b1fea320e4823e370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6B 4996 bytes
font_01_sfnt_off0000604d.bin
1934b58fd52549dc05ab95ac47e37242bf74bfea8f874c1da813005015136d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 9840 bytes
font_02_sfnt_off000081f7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F7 4324 bytes

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