Malicious PDF — malware analysis report

Static analysis result for SHA-256 519427ba1bccceb5…

MALICIOUS

PDF

42.7 KB Created: 2020-08-12 08:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7314fce9761707d1aad8d951b982611 SHA-1: cccfe90ec1a06b81cf6ebe649a1362eeafbcc802 SHA-256: 519427ba1bccceb5bdea034bbf63dbb00b2edad7df0d2fe16399097ff0f8337f
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text suggesting it is an 'answer sheet template', likely a lure to encourage clicks. The presence of a 'download button' heuristic further supports a social engineering attack vector.

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=answer+sheet+template+1+50+pdf
    • http://files.thenourishedbump.com/uploads/1/3/1/4/131453215/bca0c1f53b8179.pdf
    • http://files.revolutionpapers.com/uploads/1/3/1/4/131413905/d8515c4.pdf
    • http://nowate.area59district47aa.org/uploads/1/3/0/7/130739169/sekut.pdf
    • http://files.heroesla.org/uploads/1/3/1/3/131398097/b826ad1.pdf
    • http://suwula.christistewart.com/uploads/1/3/1/6/131606289/givara.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/lubazuwiti.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/nogowunamovonowimido.pdf
    • https://cdn.shopify.com/s/files/1/0440/9081/8712/files/fekufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/zekopuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/facebook_ads_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/8484/7006/files/mofitezuvadikakituwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1322/files/botswana_public_health_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/misanebabudulalupulagafow.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/36867249947.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/mathematics_1st_year_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/dukinerom.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6111/files/47685135602.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/59029943021.pdf
    • https://cdn.shopify.com/s/files/1/0437/3751/4133/files/20720366019.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_off00006774.bin
437512a7ea37935c2a54928a5d39cb1584396b02842946228cf56c49e9de43cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6774 5680 bytes
font_01_sfnt_off00007aab.bin
654a8c865f430e258c6b7ed584f6461c474562b060989b281bd5d867d20fe1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAB 10260 bytes