Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c28fdbbdc14aa9…

MALICIOUS

PDF

47.1 KB Created: 2020-07-29 15:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c46bfe5ba3b5dbdd0700b50910dc691 SHA-1: 00a9569df334f00f3fb9f36620eb2523b75918fa SHA-256: a1c28fdbbdc14aa9e7dc31bef5df70c9f84ba8d85815d9c4260e98ecfa9f0907
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a "personality test for students". The presence of a link farm and a malicious redirector strongly suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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=personality+test+for+students+pdf
    • http://files.finalfinishdetailing.com/uploads/1/3/2/7/132710655/levin_linebedanelu_vidaki_vukadidi.pdf
    • http://files.whitneydavisliterary.com/uploads/1/3/1/4/131408970/susanube.pdf
    • http://files.peterlynas.com/uploads/1/3/1/3/131383333/dovorami.pdf
    • http://files.whitneydavisliterary.com/uploads/1/3/1/4/131408970/
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/56764385484.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/dazojuseditojidunar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/mabozokesamolalukixenaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/wevowevatigijinomasotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3282/files/parujowejutidem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/87875324518.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/wuwonudefunapuboxupolodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1268/files/molufaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3220/5722/files/jenibar.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/1936445355.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/fifuwit.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/96048738825.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_off00007afa.bin
b65fe4267c016740a47834b0554b3229ec3d9e944dfe4d9787a04de3e06e32e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 5020 bytes
font_01_sfnt_off00008c17.bin
a61817e34fe58189ae90a4e5c5ee8285a345c68c5998cf9b4b3430efe2d138b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C17 10284 bytes

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