Malicious PDF — malware analysis report

Static analysis result for SHA-256 3617d2b2f763d952…

MALICIOUS

PDF

46.5 KB Created: 2020-08-18 13:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 758ad01fadf77fabf9d2c047c2251817 SHA-1: 48e5bdcf78529511c966218ebe01187d91140328 SHA-256: 3617d2b2f763d95280ef590b616390de589b72ebc6ce1f4872ffbe9403b45d01
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 a link farm hosted on Shopify. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though partially corrupted, contains text related to a '6th grade math expressions study guide', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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=6th+grade+math+expressions+study+guide
    • http://files.flowengagement.com/uploads/1/3/1/3/131383772/2150341.pdf
    • https://cdn.shopify.com/s/files/1/0430/1514/3587/files/mawurutikusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/xuxoninosubekowekasajuruz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/nafodawajof.pdf
    • https://cdn.shopify.com/s/files/1/0433/3581/1231/files/8733084741.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/jawoxonakolukakaxewirin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/renatujom.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/63200431067.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4686/files/uses_of_electromagnets_ks3_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/dynamics_of_machinery_formula.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/crusader_kings_2_beginner_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/mupoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/zunamajowigikug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/murder_on_the_orient_express_putlocker.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_off00007433.bin
43afbb6a6c2bba9e16dd78396a48b21e522aa3677e90bcdc1f244566a656f392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7433 5572 bytes
font_01_sfnt_off00008703.bin
d2ed777e4219787af4cf8db06952edb8f15679b8882375a099868efdbc833f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8703 11512 bytes

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