Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28835dd4558668b…

MALICIOUS

PDF

33.9 KB Created: 2020-08-07 19:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a40c503df339da2ad50b75be613778aa SHA-1: e259352abb9a6bb97cf23e2484762273ad328259 SHA-256: a28835dd4558668b1d1144e46b174797e73614aff0506a5bfdbe05f38f9a5e05
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results for educational materials, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the target search query and the malicious URL. The presence of numerous external PDF links suggests a tactic to inflate search engine rankings or distribute malicious content.

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.ru/pify?keyword=ags+world+history+textbook+answers+pdf
    • http://files.resoundyogastudio.com/uploads/1/3/0/9/130969399/liguzuwulub_deposik_bigibi_losegibaj.pdf
    • http://files.bkindboutique.com/uploads/1/3/1/4/131409244/940ce37469.pdf
    • http://files.superiorkitchenhealthysolutions.com/uploads/1/3/0/7/130776503/zutudawinidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/all_rules_of_articles_in_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/relumagomebipif.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/228990692.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/gudupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/71625115770.pdf
    • https://cdn.shopify.com/s/files/1/0429/5658/7174/files/41299990736.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/7574711824.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/38700557421.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/solubajopo.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_off00004558.bin
20ccfb9fdbd7fce31fa57b51129a27cf501f058cd63922d79b42e5efc3181b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4558 5760 bytes
font_01_sfnt_off00005908.bin
84d23ae125113975ca36b3e51cd559fd6a2ec526ad181efcd396103429627db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5908 9832 bytes

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