Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe40445cdcbf0eb…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 16:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66ba1f45fd1ac01662997e990ff4b5e4 SHA-1: c64000c986d5d1c076fc45e096f1c661eff04a02 SHA-256: ffe40445cdcbf0ebc5383b095173e1ad09830beb0d33eb67875f568de5934938
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/pify?keyword=converting+proper+fractions+to+improper+fractions+worksheet'. This URL is presented within the document body, disguised as a worksheet, suggesting a phishing or malware delivery attempt. The document also contains a large number of embedded links, many pointing to Shopify domains, which is flagged as a link farm. The primary malicious IOC is the redirector URL.

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=converting+proper+fractions+to+improper+fractions+worksheet
    • http://gupubab.survivalbetty.com/uploads/1/3/1/3/131384709/4175147.pdf
    • http://saxudit.lincolnstation.org/uploads/1/3/0/8/130874540/naruzizekapujem.pdf
    • http://files.10000wordsphotography.com/uploads/1/3/1/4/131406977/nokazusew_vopuvobili_sosinoxakoxawig.pdf
    • http://files.wdmoc.com/uploads/1/3/0/7/130740443/tejovasoxuxo.pdf
    • http://files.trailbrake.us/uploads/1/3/1/3/131381518/wogorunaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/timulosad.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/ponirogolutoluxav.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/jawiketulejusojexafunuvul.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/cll_guidelines_nccn.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/51067434134.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/xekusosefipid.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/algebra_formulas_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/mupisegevawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/vixonitigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/34506905592.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/92608514389.pdf
    • https://cdn.shopify.com/s/files/1/0431/6089/5650/files/four_year_high_school_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/ck2_agot_download.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_off00005e6c.bin
736b7d13f32320d8d110afd2d5efcb4dbfac3902e4ed557d93ec827a464e7d41
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6C 5516 bytes
font_01_sfnt_off00007124.bin
163177dd6df02d3457358bce8e4cc2a404a6128fc81cc637a08f671486b10adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7124 9816 bytes