Malicious PDF — malware analysis report

Static analysis result for SHA-256 555d3142acc37dcd…

MALICIOUS

PDF

39.9 KB Created: 2020-08-08 02:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c35abe0716def98cb01d4ce98c3ba4 SHA-1: 3cbc975819520a021942791d1acffffd83ec5c45 SHA-256: 555d3142acc37dcd9490dabae43ddc946a2ff53da6b220d1fc8f00f2a53e78da
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, a common SEO spam technique, with the primary malicious link pointing to a redirector. The document body, though heavily obfuscated, contains text related to converting PDF to JPG, which is likely a lure to attract users to click the malicious link. 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=pdf+file+ko+jpg+kaise+banaye
    • http://files.treefaeriefotos.com/uploads/1/3/2/7/132710753/bedujekabiretun.pdf
    • http://files.theoeco.org/uploads/1/3/0/8/130874180/wakajemulupajabova.pdf
    • http://files.procounseling.org/uploads/1/3/0/7/130738852/nodira-savotifejido-vujasijatosavur-lolib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/riwapuborosakenupegepujod.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/buriwuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/takatejixuwotofebonufi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/77226993004.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/30960641842.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/jasuxuwudatezutadiguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/kibesijejamewurek.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/52863235905.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/62184970493.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/vebuzanavozidig.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_off00005dfb.bin
bdac550763c4aa26b313cab4da308cbc07a4f4c8bed4fbdad31e091e82a9f595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFB 5496 bytes
font_01_sfnt_off000070d0.bin
0ad17d5aefbb764207b791bd5012872379635e91672a1698cbd68b2a9dde28e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D0 10040 bytes

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