Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16af98e115957ab…

MALICIOUS

PDF

33.9 KB Created: 2020-08-08 04:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4deef5cc3399e0c675e9ccee122791a SHA-1: 2f2259e05da99a362b8826de4e35f89f7e32145f SHA-256: f16af98e115957abc0780a5df927786cd9e29fb0a00fecda9181fa6a839671fb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'grammar exercises for class 4 pdf', likely a lure to disguise the malicious intent. The ML classifier 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.ru/pify?keyword=grammar+exercises+for+class+4+pdf
    • http://files.journeystheroadhome.org/uploads/1/3/2/6/132682882/2304856.pdf
    • http://files.digbytrails.ca/uploads/1/3/0/8/130814676/f67caab469d28.pdf
    • http://fotegiv.artrivative.com/uploads/1/3/1/4/131482975/63965ccce2f.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/definition_of_pestel_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/kufuniketirademomober.pdf
    • https://cdn.shopify.com/s/files/1/0434/4761/5649/files/61970475132.pdf
    • https://cdn.shopify.com/s/files/1/0440/3996/2774/files/mofebapebenobikuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/98710456707.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/bihar_police_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/chevening_essay_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/vawulizuvixodo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/pennies_to_dollars_converter.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/33697557438.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_off00004732.bin
adaf814634152355f185370fc76020ae96bd62f9621f6bcdf550bbfc0ca18ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4732 5488 bytes
font_01_sfnt_off000059d5.bin
645fe71cfdeaa12a1dd00167e860fe5e2154f6ba348f7e295b5b0b1111d87fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D5 9752 bytes

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