Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d822c3add17500…

MALICIOUS

PDF

44.8 KB Created: 2020-08-17 15:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2d1f855b3c4a37a85eae27b82d75223 SHA-1: eaa2dc5c70b9f15ab7438a196b6974415c7ef3c9 SHA-256: 46d822c3add175008a79e2869845938baac0183c5be12961ca2200eef2b3db57
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text related to 'interview questions' and includes the primary malicious URL. 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=interview+questions+answers+for+teachers+pdf
    • http://dalugovu.clickfourhelp.org/uploads/1/3/1/4/131406121/3552093.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/95610197745.pdf
    • https://cdn.shopify.com/s/files/1/0439/1475/6251/files/jeffrey_archer_best_kept_secret_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92588710477.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/vimuwereluzujopoluwiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/1002/2814/files/gijuwakujatetoze.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/fefonade.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/16628652422.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/mubomawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/28522533481.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/jabuxogudepunaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/tuvibejurururateref.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_off000070ab.bin
efa04435632d74bcffff1bd58a6104b0339650b39e2f269bb122059476aad8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AB 5424 bytes
font_01_sfnt_off0000832d.bin
eedf0b3701b60e158445641056a22e7ddcd9db1dfb64de5c5778980db4a27e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832D 10304 bytes

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