Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b218553eb07e4c5…

MALICIOUS

PDF

54.1 KB Created: 2020-08-11 20:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f2ba43eba09a8fe5917d7474da90c9 SHA-1: 43d54060d2f4aab0b25066843ffe2bde936756c6 SHA-256: 1b218553eb07e4c5b1dd92c14c4e4b45ab9f7f2d1a7ae7face043c2fec8e87dd
130 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, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=basic+english+grammar+for+competitive+exams+free+download+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to downloading grammar PDFs, suggesting a lure to trick users into clicking the malicious links. The presence of a visual download button further supports this social engineering tactic.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=basic+english+grammar+for+competitive+exams+free+download+pdf
    • http://files.windsweptpoodles.net/uploads/1/3/1/3/131379740/1317381.pdf
    • http://wogul.withwhitandgraceblog.com/uploads/1/3/0/9/130969744/sagexufaz-nafojefanano-lebuzeno-meditidajiwo.pdf
    • http://files.davero.ca/uploads/1/3/1/4/131414134/genex_laditu_doviroxadek_rutujidovale.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/37205068838.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/convert_file_to_word_2020_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/panexojotomiwidozetig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/54299164365.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/16412557910.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/39034705666.pdf
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/tiwiluwugej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1510/files/zobipomukofor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/42873406414.pdf
    • https://cdn.shopify.com/s/files/1/0432/9177/1046/files/2302982595.pdf
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/best_annotator_ipad_apple_pencil.pdf
    • https://cdn.shopify.com/s/files/1/0428/3986/7559/files/katubosusemisojof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d43.bin
4a2ae6f05fe6cb28b8dcdfc0febd9b2f33f41e41f3c9c06f14e236f5054a58c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 5840 bytes
font_01_sfnt_off000080fa.bin
f6a350d844d69d662e4b7aad30ad4aafcf7250df296d59478399a5f258c93a59
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 14468 bytes
font_02_sfnt_off0000ae2d.bin
6f6ab336195385aa53d775b482815c1be3e34fb9c57cd8fbb748a0b9232a0715
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2D 8336 bytes