Malicious PDF — malware analysis report

Static analysis result for SHA-256 b405b9e1636d1d53…

MALICIOUS

PDF

46.6 KB Created: 2020-08-19 10:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 809ce11dbb3b2e6235c08fe35088f0b4 SHA-1: 40a983241f5b7476e8789c235c7ebb8b41773163 SHA-256: b405b9e1636d1d53d364461fcfb368a3d11b01dab9df07d34ec83d3f1b1113d5
128 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains. The presence of a 'download button' heuristic further suggests a lure to click on these links. The primary intent appears to be directing the user to malicious infrastructure through a deceptive link.

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=bbmp+old+pid+number+format
    • http://files.stonemountain-capital.net/uploads/1/3/1/4/131452824/nezobunivoki.pdf
    • http://files.buntcounselling.co.uk/uploads/1/3/1/1/131164198/nesen_taguladilojixed_degikaguvubede_pefajujus.pdf
    • http://files.ccmplbca.com/uploads/1/3/1/6/131606373/susajodokipe-vulotibida.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/ralovuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7479/files/storyboard_software_free_mac.pdf
    • https://cdn.shopify.com/s/files/1/0445/8224/0420/files/active_and_passive_voice_simple_present_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/48376476426.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/nom_riesgos_psicosociales.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/66648508685.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/4003678286.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3798/files/whatsapp_profile_picture_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6284/files/38335236813.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_off000063c6.bin
eed7bb240cce136a4f8e9817ecd8d5aed4d1a12152866824dbbfcb1dd823de96
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 5200 bytes
font_01_sfnt_off00007551.bin
72080fb89f63b05d461afac04998045bb4535c8cfc207a4e827fca34654feb81
pdf-font-stream PDF embedded font (sfnt) at offset 0x7551 10112 bytes
font_02_sfnt_off00009839.bin
36ed9caf719e0849df8fd87ade7d51f3d04b8af5454f1aaa896d38a56b473f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x9839 16272 bytes