Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67a92014bc9e15a…

MALICIOUS

PDF

68.2 KB Created: 2020-08-05 16:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045018b35fa09c0dd1b73a3f05c9adb6 SHA-1: 44a4535ba55252b421b2174bb8086bb879050dbc SHA-256: f67a92014bc9e15a85cda0ed05730802abf6b5699f3c450c6e305d74e1510fc3
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=bash+shell+programming+tutorial+pdf'. This URL is presented to the user as a "Bash shell programming tutorial pdf", indicating a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on Shopify but point to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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=bash+shell+programming+tutorial+pdf
    • http://files.learntodaytutoring.com/uploads/1/3/0/7/130775350/e2df50db.pdf
    • http://pibatex.comoxvalleyringette.com/uploads/1/3/2/6/132681443/4c8f67c02f6f.pdf
    • http://files.lowcountryliberals.com/uploads/1/3/0/7/130775867/jazomowaseda_jegop_pusopadafaxemu.pdf
    • http://files.movementmatters.net/uploads/1/3/0/8/130873708/dexapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/morufuvifatesumixup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/evangelio_apocrifo_de_judas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5754/5365/files/kimisinirezeruzugudapep.pdf
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/auto_tune_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/seforewikuxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/shopify_landing_page_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/73564224273.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/fuvenekalarobir.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/nigerian_banking_industry_overview_2020_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/54428390212.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_off0000cac4.bin
3a5a3ab76c2e1572988f83867110df5d39f9288fc687790fdb30ac3a008a712a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 5504 bytes
font_01_sfnt_off0000dd53.bin
0bf8482d8bcd79e328f150257daec34c5855135b1c8d3f01ac79efe8f3fe069a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 11604 bytes

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