Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe1493653785dad…

MALICIOUS

PDF

50.4 KB Created: 2020-07-28 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a48aecea6ce222eafda81ef14d514faf SHA-1: bc403f3d38738b095f4b037174d49777b97ddb82 SHA-256: 1fe1493653785dad83483a8ade24056b204d9c9170d71220e3b0089476164ad5
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'engine assembly screensaver free'. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm tactic. The ML classifier 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.ru/pify?keyword=engine+assembly+screensaver+free
    • http://files.carlosalfredojr.com/uploads/1/3/1/3/131383467/mosavalewuz-buxuzadizamif-mixorajavotogup-kuvafowojijaxib.pdf
    • http://files.ubwaosu.com/uploads/1/3/1/3/131383838/175422.pdf
    • http://files.oakmountainfirewood.com/uploads/1/3/2/6/132680808/zuxexo-selagibafububaf-tulavu-vogigewover.pdf
    • https://cdn.shopify.com/s/files/1/0441/3983/9640/files/49962939822.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/mimabarabasu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4722/2422/files/22833541513.pdf
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/56193402976.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/72564300090.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/80801908208.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/dejuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/konomokoto.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/wugitiripererufidori.pdf
    • https://cdn.shopify.com/s/files/1/0432/3354/2303/files/77938262669.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/26552222621.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_off00008980.bin
4dc986a82c3e92dffd82307da36a43a6275a59a7de36c129810736aa4f72aa55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8980 5056 bytes
font_01_sfnt_off00009a9b.bin
013432d846efadc50eea44d494f8f59f586421c49cffb4a6cacb0b30408b5671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9B 9908 bytes

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