Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1eb6921037d3d91…

MALICIOUS

PDF

34.1 KB Created: 2020-09-09 14:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfca23bb427fbef6b776b7177cc964c4 SHA-1: 66741fb8602acd69133ac0c272b1dd4efa2b7d84 SHA-256: a1eb6921037d3d913de978b821132a7701ac3a81c9d5c94a794f3dde06fd94fe
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body itself, though heavily obfuscated, contains the same malicious URL. The presence of a large number of external PDF links, many pointing to unknown domains, further supports a malicious intent, likely to redirect users to malicious content or phishing pages.

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.link/pify?keyword=free+ahoy+its+a+boy+invitation+template
    • http://naferipe.drhannahcurtis.com/uploads/1/3/1/1/131163635/zolow_soxex.pdf
    • http://xewitil.monamoody.com/uploads/1/3/2/3/132303195/89918.pdf
    • http://resiferim.allsaintshighwycombe.org/uploads/1/3/0/7/130776819/lupane_wepomegijumev_nolab_kukawez.pdf
    • http://files.greengeckopublishing.com/uploads/1/3/1/3/131379732/f35c105de387b.pdf
    • http://files.greyart.net/uploads/1/3/0/9/130969191/zekatamedepameb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/rhel_lvm_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0464/3110/9272/files/xozepulumibovejinepeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/60405758143.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/juzenesigod.pdf
    • https://static.usrfiles.com/ugd/3b6424_031767c20d914973b6cb9870badf3022.pdf
    • https://static.usrfiles.com/ugd/30e015_751720f4990740d2af19163916413fd4.pdf
    • https://static.usrfiles.com/ugd/3794ad_0ee0513d3b5c493a8ab47321e28d56d7.pdf
    • https://static.usrfiles.com/ugd/01f9b9_1a0330e6ebba4223836710288a5cb288.pdf
    • https://static.usrfiles.com/ugd/7c3584_ee32236b8e2c42b6a6b95c7a957c98f9.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_off000048bf.bin
ae85d61a3e600dceaac364b43ff0bb8318bf59a178e793fbdf775ce889e0c19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BF 5316 bytes
font_01_sfnt_off00005ab4.bin
ef53743f16eea96b31d64e0fa80d9b62ef81fed326963625db54bab846776641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB4 9652 bytes

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