Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac25c9b63791ec13…

MALICIOUS

PDF

51.3 KB Created: 2020-08-09 13:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abb085cf9bedec1b121f630555872a51 SHA-1: 57acfdf8b8ccbad1fae3ba5e15674a40e6e59583 SHA-256: ac25c9b63791ec1313297c33552c7cfe4968cfe52ccf6c352754eab8d271f90f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body itself is obfuscated but contains the URL 'https://ttraff.cc/pify?keyword=burger+king+coupons+oktober+2020+pdf', suggesting a lure to a malicious site. Additionally, a large number of external PDF links were found, indicating a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.cc/pify?keyword=burger+king+coupons+oktober+2020+pdf
    • http://files.lgfb4her.ca/uploads/1/3/1/3/131380641/sazivivififo-tuwen-luzeju-xewirokuge.pdf
    • http://punizepel.drumsation.com/uploads/1/3/2/8/132815002/sunibox.pdf
    • http://mafozos.pixiepatchbda.com/uploads/1/3/2/6/132696194/vogirokujopiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/assessment_and_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/antagonistas_de_los_opioides.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/munafumojorenivufepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/paxeripir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/ruwatudoposulob.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/74683106861.pdf
    • https://cdn.shopify.com/s/files/1/0433/2922/4857/files/nepiwujof.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/voduzadizobawuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1826/3448/files/hepatomegaly_differential_diagnosis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/56066952418.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/mufizamatasomuxemesonan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/39021794437.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/44647428009.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/psi_tutorial_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/24672466167.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000565f.bin
add910c80d675fe24c7aa4cd42078d5f4dd4c668a2113004abb639f65ad54139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565F 5492 bytes
font_01_sfnt_off00006916.bin
a22d9081b68bdd670a2d45980483e058a0b57da14bfd5fcf53e642e745b01788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 3284 bytes
font_02_sfnt_off00007643.bin
6905a274755f5eee964ae5c744c6efc3822691c938ad331e0a2396698599dc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7643 6996 bytes
font_03_sfnt_off0000892e.bin
73a89f3d9d8bce8ca6573ad527a61758b954fc088d05b565cf15be15028e7f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892E 11048 bytes
font_04_sfnt_off0000aef1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 4324 bytes

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