Malicious PDF — malware analysis report

Static analysis result for SHA-256 944c188d4d427656…

MALICIOUS

PDF

39.2 KB Created: 2020-08-11 04:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6512b41f6149e52d1b539e1b9bf3dd44 SHA-1: 7fd9d9281fbc73bce0f89ee42e835a71703bdb54 SHA-256: 944c188d4d42765653390c68de4ba2aba2563c6fff7f693b00e31a690ded692e
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. It also exhibits a PDF link farm, with numerous links to external PDFs hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and several other PDF URLs, some of which are hosted on suspicious domains. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The primary IOC is the redirector URL, which is likely used to funnel victims to malicious content.

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.com/pify?keyword=english+english+tamil+dictionary+pdf+free+download
    • http://files.lowerarkplanjm.com/uploads/1/3/0/7/130775413/5c0d2e2c2.pdf
    • http://files.lwcmusic.org/uploads/1/3/1/3/131398022/wozijapusup_vijabotumi.pdf
    • http://files.nativetales.com/uploads/1/3/0/7/130775942/b90bae542e.pdf
    • http://files.issosf.com/uploads/1/3/0/8/130813768/gepisefuwen_dilugipiruwa_nopotum.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/muwix.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/pakulobag.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3981/files/61882761837.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/76846859549.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/94754024821.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/buximijijutewazamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/totapivoxujivezufuxesawis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/baldor_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/calendario_sep_2020_y_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52209678420.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/meek_mill_mp3_download_skull.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/nebivigibiza.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_off000058b4.bin
2a5b4846757a8bd66e37a2e76b255e0f9d8b7c2b585632e3e4e0185ce71d1961
pdf-font-stream PDF embedded font (sfnt) at offset 0x58B4 5720 bytes
font_01_sfnt_off00006c0f.bin
c1c38002eac648326f3b49489c78969a884e92abf37197dd5da7747238653748
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0F 10380 bytes