Malicious PDF — malware analysis report

Static analysis result for SHA-256 b111b3725d9cac5b…

MALICIOUS

PDF

34.7 KB Created: 2020-08-18 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a02fe98498d8032966df2d73314987c5 SHA-1: a62f17299c29a9b766bee25524096b0a4970730b SHA-256: b111b3725d9cac5bde6cf4a28e01bd701be13f84a8ffbcb7420581fe4cf32d18
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=half+the+world+away+guitar+sheet+music', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to guitar sheet music, suggesting a lure to entice users to click the malicious link. The ML classifier strongly indicates 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.cc/pify?keyword=half+the+world+away+guitar+sheet+music
    • http://files.asteroidea.ch/uploads/1/3/1/3/131379971/bddfb08.pdf
    • http://files.stlukesway.org/uploads/1/3/1/8/131871730/dufilamapig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/fobuxibixe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/temolow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/24976335337.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/puniwino.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/ms_visual_studio_2010_shell.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/gifepizanakilokajevutinef.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/vejojudixizowadurubufagug.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/consumer_buying_behaviour_model.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/pukivowasowirinolavidogug.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/xasogopojusodinepimesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/25388445708.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/11827160619.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/88764499478.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_off00004771.bin
36b4baeb0e908a574e82558180240fb6f2dff31fd408494ac356a319efe70107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4771 5592 bytes
font_01_sfnt_off00005a6a.bin
8899988a87432039ae29f9a2073c206fe0bfc8b62442c032ca63ce097dbd1e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 10284 bytes

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