Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f57561a9070e9f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-05 00:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c0f9dc2a998fadc70aac7c06aa1ad1 SHA-1: 067bbd5036d7e90e924c6eb949d3e88a44983d46 SHA-256: 20f57561a9070e9f626aa064a807c86e7437d6bad0c7c26aca0a8fab1b747076
130 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=interview+questions+for+freshers+pdf'. The document body, though heavily obfuscated, contains text related to interview questions and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=interview+questions+for+freshers+pdf
    • http://saxapu.steppingstonedaycare.nl/uploads/1/3/1/1/131164243/2269762.pdf
    • http://xulabe.lataca.co.uk/uploads/1/3/1/8/131872055/batojuduma-kebiwuw-divunibip-fogowosiwopeb.pdf
    • http://files.pawsinneedanimalrescue.com/uploads/1/3/1/3/131398386/5807918.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/xuxozefimatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/85332214981.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5591/files/31366219292.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/tapamoliremutubex.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7011/files/89246906407.pdf
    • https://cdn.shopify.com/s/files/1/0436/7217/4745/files/67029287449.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/bowovegopafojajopepot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/14526362047.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/90143693267.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/wezul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xuvoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/xesajifolowuwodiramabixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/5557522425.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_off0000697f.bin
69b333aa33b4bb5e8d051fd158f5f4d8820b20f92124d78b321b133ac86ae7a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x697F 5100 bytes
font_01_sfnt_off00007aee.bin
3cff55268fe2fe4577f70f26f31194d555921591e7b3b213d3248dd21273d9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEE 10108 bytes