Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a99162e05c94981…

MALICIOUS

PDF

47.2 KB Created: 2020-08-09 11:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02a19f12bdf66760341fdbccd50e0d7b SHA-1: c18e097ee365976198b12fcb0cfbf4d5a5dfe592 SHA-256: 8a99162e05c94981809756f31c1706d44f5afd613b1f0cd8f1f3d45bc8f4a366
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=arabisch+lernen+f%25C3%25BCr+kinder+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious redirector. 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=arabisch+lernen+f%25C3%25BCr+kinder+pdf
    • http://files.ericbroadvet.com/uploads/1/3/2/6/132695351/4971761.pdf
    • http://bilovir.littlegiantproductions.ca/uploads/1/3/2/8/132814930/3628997.pdf
    • http://files.helpingthoseleftbehind.com/uploads/1/3/0/7/130739251/90c4ae484524d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/zuluvab.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/32273491133.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/how_to_push_on_github.pdf
    • https://cdn.shopify.com/s/files/1/0444/8894/9927/files/ebook_reader_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/tidokeremupoliji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/18695319351.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/roferexuligari.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/37082757998.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/57332297903.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/7136137376.pdf
    • https://cdn.shopify.com/s/files/1/0436/5346/4214/files/pewaxezafisalumugex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a00.bin
a66622dae6d6b2582d5230e8e937fd5d0ef2a8bc521f7fcf2131d1badd0e2811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A00 5156 bytes
font_01_sfnt_off00007b69.bin
d1d15ef20d0b228ca5b757fbef275ed06f52dd875403213e177061a95f1e4880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B69 10936 bytes
font_02_sfnt_off00009f6a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6A 4324 bytes

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