Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1263c8ba2ce882f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-03 03:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1aa2fe4de449c7ac79c3043b445ffb SHA-1: 6ae2256cd8b0e380a4523f429ae7b89a0012277a SHA-256: e1263c8ba2ce882f55fd1ad1edebd13f1f48daf212b82a1e14721acfb96ed147
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with the primary link directing to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to academic subjects, suggesting a lure to trick users into clicking the malicious links. The ML classifier also strongly indicated 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.ru/pify?keyword=mathematical+methods+in+the+physical+sciences+pdf
    • http://files.systercute.com/uploads/1/3/1/6/131637362/f3d69194d6.pdf
    • http://files.plantdrpeter.com/uploads/1/3/1/3/131382239/f52b3fc9934f95e.pdf
    • http://files.iolabaptisttemple.com/uploads/1/3/2/8/132814305/numozejuno.pdf
    • http://files.baycountrycrabbingsupply.com/uploads/1/3/1/4/131437085/bb5f6fd740ef65b.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/mijovigosejonume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/femepotufitaxaturu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/sum_41_wikia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/36387588047.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/20489324647.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewubi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/lajekikokigixiluvem.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/likixitu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/91386523738.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_off0000650b.bin
0aa912214cf161c2f592e9623de6a13fa3d2f8019ca1a57fb3f46c1b469641a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 5408 bytes
font_01_sfnt_off00007764.bin
8267ec7e5bc83b08f7ec4293c0ba39c36852c630f92626714a4880c7d5c079e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7764 10980 bytes

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