Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6be6c96d9d8b151…

MALICIOUS

PDF

40.4 KB Created: 2020-07-20 02:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b73f5c04d4f5b72488ce4d01678ad6d0 SHA-1: 7a820994288c3712ae8d697cf4d31b58ce2569fc SHA-256: a6be6c96d9d8b151d427c2dcb9481218dab03ed853113680b6ee268fc4734ad8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to funnel users to external sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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.com/wb?keyword=oswaal%20books%20class%209%20pdf
    • http://files.jhaytersmilestudio.co.uk/uploads/1/3/1/3/131379546/puxofexelema-xovuze.pdf
    • http://files.angieskonacoffee.com/uploads/1/3/2/3/132302924/9876172.pdf
    • http://files.liquidsunshinedesigns.net/uploads/1/3/1/6/131606644/6427307.pdf
    • http://files.innerframework.org/uploads/1/3/1/4/131453268/0d449b1710b.pdf
    • http://files.integritydetailcookeville.com/uploads/1/3/2/6/132680986/gugonidugo.pdf
    • http://files.igccb.org/uploads/1/3/0/7/130739369/db1be2540.pdf
    • http://files.newparkclosefrc.com/uploads/1/3/1/4/131406807/kafavexiwoke_mijegak.pdf
    • https://zexixomiwos.files.wordpress.com/2020/06/25052775313.pdf
    • https://gugibuno158581699.files.wordpress.com/2020/06/dixuk.pdf
    • https://fukigus.files.wordpress.com/2020/07/6684628864.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/53274284624.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9164/files/julux.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/21920803143.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/24901482887.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/nozagebarenot.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/71032746210.pdf
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/jumemivabekonixijasukuza.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/
    • https://zexixomiwos.files.wordpress.com/2020/06/2505277531

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060fe.bin
59722dad5f15e6347c3df15dc7f655ef240758e436d7be6315122a0f4bade153
pdf-font-stream PDF embedded font (sfnt) at offset 0x60FE 4968 bytes
font_01_sfnt_off000071ee.bin
d5c9a0a0cf42c0d65f78c1fe6cdce3c37db319fa75b3a936f068b51287f11247
pdf-font-stream PDF embedded font (sfnt) at offset 0x71EE 10156 bytes