Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a6edcf95b611b9…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 08:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63787aff3f85a8c9fd62fe4a30092c5 SHA-1: 7bda83ae4a7ec462060f5e230dfc857fd5ae8671 SHA-256: 35a6edcf95b611b9170ade5c8a17ef75f2faf9886ee85ad7970b807a0e17e9c2
160 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA prompt to lure the user into clicking a link. The primary malicious link identified is https://ttraff.com/pify?keyword=va+form+21-+8416, which is a known malicious redirector. The document also hosts a large number of other PDF files on Shopify domains, likely as part of an SEO link farm to obscure the malicious activity. No scripts were extracted, but the presence of a malicious redirector and the fake CAPTCHA strongly indicate a phishing or scam attempt.

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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=va+form+21-+8416
    • http://files.porvenirmassacre.org/uploads/1/3/1/1/131164260/7536692.pdf
    • http://files.everydayverde.com/uploads/1/3/1/4/131453111/weleniwonewapu_luzupakojon_nawozixupebaw_xadon.pdf
    • http://files.insitju.com/uploads/1/3/1/0/131069904/37120711f58.pdf
    • http://files.cumnocknswmemorials.com/uploads/1/3/1/6/131606954/273dd22a878a.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/98676756430.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdf
    • https://cdn.shopify.com/s/files/1/0429/2031/2991/files/85372056932.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/ableton_live_9_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/57713210316.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/fobedutab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojijemorewowasimagaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/fufedagemobaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/webus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/watije.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/93657911825.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_off0000653a.bin
ec9b75cb9091c0b280037091f176596b5c5dd89a7188e920c316855dee8e30ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 5320 bytes
font_01_sfnt_off00007758.bin
8e5401c5dd761b23ed5473d7c0b0813856032dea13351dfc7c18f8648d103770
pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 10096 bytes