Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f95f85327467d32…

MALICIOUS

PDF

37.6 KB Created: 2020-08-21 05:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0175a2d6de057d5d57fa7a8a6f11f25b SHA-1: f0f4260f1b95cf437ada6dad38396a75271eac10 SHA-256: 4f95f85327467d32f97229430ea76c09630e4c1d4e98898fb0d37f99d1c57fe4
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary URL redirecting to a malicious domain. The document body, though corrupted, contains text related to educational worksheets, likely a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. The ML classifier also 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.cc/pify?keyword=writing+two+step+equations+worksheet+7th+grade
    • http://files.staging.cornrowsandco.com/uploads/1/3/1/4/131407445/vibikawewizerebog.pdf
    • http://files.prairiedawn.ca/uploads/1/3/2/6/132680813/6413843.pdf
    • http://files.maizewallin.com/uploads/1/3/1/8/131871586/nopavu-dulupokegif.pdf
    • http://files.brianhecht.com/uploads/1/3/0/7/130739776/zabewezikojetemax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/13228361367.pdf
    • https://cdn.shopify.com/s/files/1/0438/3483/5094/files/rezob.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/food_tent_card_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/flipping_table_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/xurepijazinajoriwuxize.pdf
    • https://cdn.shopify.com/s/files/1/0462/2372/0602/files/block_blob_tostream.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/60532505204.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/29793928458.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/zijutuvilimazetat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/gameveradibasekorinolelit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/generic_odometer_disclosure_statement.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_off00005413.bin
6c35337272034e025297fa09177e0aa51b9761cfa4286c83aea69e2d19ae9c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5413 5564 bytes
font_01_sfnt_off00006715.bin
a4324c63f63859d45096582d1bf63e7aabda7dd379034896a25c50f53f73d4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6715 10004 bytes

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