Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc5d11b61dabf75…

MALICIOUS

PDF

36.7 KB Created: 2020-08-12 23:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b6a9ad7146b895eabe64f9440fd7c6 SHA-1: 2a2749ca0b9092577e12ce28d5fc643c7e2fcae6 SHA-256: 8fc5d11b61dabf753d95bca85a0248e47555c13df712d9c1fa491377372017ad
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. One of the primary links, 'https://ttraff.com/pify?keyword=the+biology+of+osmosis+jones+questions+answer+key+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm behavior is sufficient to classify this as a malicious document.

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=the+biology+of+osmosis+jones+questions+answer+key+pdf
    • http://files.clipture.net/uploads/1/3/0/9/130969543/7a971979da11.pdf
    • http://files.stfeichinsns.com/uploads/1/3/2/7/132741194/piginugulomokozugo.pdf
    • http://pawafabud.rimonim-liturgy.org/uploads/1/3/0/7/130738511/lowodefiwol.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/15951410295.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/9786446093.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/91010948928.pdf
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/35758498469.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/41758213386.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/denukudovujaburamiwawonus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/zifukixavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/69127426547.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/vascular_anastomosis_technique.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/xesokelonipikitaxe.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/26324614998.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/tkinter_python_3.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_off0000503d.bin
36267998e6a425bf776a2048f058b525dd25080757bf238dd54f0f44c82ddc1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503D 6004 bytes
font_01_sfnt_off00006499.bin
763ff192f2eb188589c9211bff765ca25584eb3220b2a11c9c4ad8f05ad8a18a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6499 9800 bytes

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