Malicious PDF — malware analysis report

Static analysis result for SHA-256 f064f5c7904aa0d1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-01 20:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c13909e1883696c12d317b3926acef SHA-1: 9736e59cd3a4a4b11cd8945017ebf4c07d5b0b1c SHA-256: f064f5c7904aa0d10915c7227d0736bacc7dffa192c3d75806803f1d2ca6e29e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=norton+door+closer+adjustment, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious activity. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=norton+door+closer+adjustment
    • http://files.coefyouth.com/uploads/1/3/1/0/131070151/buravomeb.pdf
    • http://files.tapcater.com/uploads/1/3/2/6/132695568/wotewonebumux.pdf
    • http://files.tampabayplasticsurgery.net/uploads/1/3/0/8/130814342/pakowuvomes.pdf
    • http://files.evolverealty.ca/uploads/1/3/0/8/130874035/1219477.pdf
    • http://files.cmgworldwidefashionweeks.com/uploads/1/3/0/7/130776855/f2a97.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/pekejab.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/39321445861.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/wefafokinekudupifatal.pdf
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/10615367955.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/94837145505.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/pefanaxolobamupisadawaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/lapilusadibisexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1566/files/mubugerejovujilopuni.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/67905899659.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/fonixigajuvarigagadixixox.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/zixelabelelubolube.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/44831014528.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.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_off000072f7.bin
b35517fe1fdcce246bea95abdbe3278d302ca1d6447785f783d06ad1b84d1ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F7 5132 bytes
font_01_sfnt_off00008458.bin
49e73a752ac9021ae7f142f915aa6a0cd86a03ddb81d90600169f2fd5a9139e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8458 9312 bytes