Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b09df3054733c2…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 08:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e82be1035448b209a76591c2f9dadae SHA-1: 2178040c6e32eac9cccf8f76af018b554973c4d7 SHA-256: 88b09df3054733c2cbcbeb1725bcfa99c7241ff169d1d5adefa460afcb577376
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=balanza+de+laboratorio+pdf'. The document body, though heavily obfuscated, contains references to 'Balanza de laboratorio pdf' and the malicious URL, suggesting a lure to a malicious site disguised as a PDF document. The ML classifier also strongly indicated maliciousness.

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=balanza+de+laboratorio+pdf
    • http://files.charisacctservices.com/uploads/1/3/1/6/131606758/caf2cc85aa266e.pdf
    • http://gixoz.66tandem.com/uploads/1/3/1/1/131164250/selemet.pdf
    • http://noloxiraf.thesheilingshetland.co.uk/uploads/1/3/1/3/131383791/pufimolaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/sunudexekotavawu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/34419937671.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/34344031617.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/kezaroveji.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/9884335300.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98774508290.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/46539969892.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/tepovef.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/gojidusulifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3036/files/5920968258.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.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_off00006570.bin
a47528e39fb3009035915d0e8812e2aa69acc5048d8e4a5b0a087cbe46ee523a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5096 bytes
font_01_sfnt_off000076d1.bin
f2dd367bbcc07eac0f5791d80251bd47d8c9b752677b11ce6da8e6314dd477a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D1 11152 bytes

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