Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19825b623c627f5…

MALICIOUS

PDF

43.1 KB Created: 2020-08-07 19:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce38e0fbc9f7f97bac89bfccf2f5d0c SHA-1: 5cac8323411500a0e75e82128ba946bf0348e5c6 SHA-256: e19825b623c627f51a7e1c5e9e4ca38f56c6fd8bb1d5627ff27e338850bf2659
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.cc. The document body, though partially corrupted, contains the same URL and a reference to "vocabulary games esl pdf", suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, which are likely part of a SEO-based distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=vocabulary+games+esl+pdf
    • http://files.drcoreycipolla.com/uploads/1/3/0/7/130740264/kataradimex.pdf
    • http://files.yoursongstory.com/uploads/1/3/2/6/132682528/sijalerajo_duruvolesabej_duvuponeno_ronuxufenov.pdf
    • http://files.chattaction.org/uploads/1/3/0/7/130775027/wedurixivib_bumumon_vibilamed_devatipo.pdf
    • http://files.missoryansclass.com/uploads/1/3/2/6/132682106/pegeze.pdf
    • http://files.everydayava.com/uploads/1/3/0/9/130969761/mobaxerovaxefo-lonufafulot-momaxosisonukum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8193/files/pewarizoresawiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/88220731665.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/wimixoko.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/broken_vessels_amazing_grace.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3567/files/tizuvunofogusoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9095/files/83658572098.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/nuxozofujujariwejibosu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3507/files/gaxaxafilisulegejunowose.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xagene.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/19762174323.pdf
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/863-_825-_1348.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/rusiperebalanagofunal.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_off000069c8.bin
140490ec8366fead4eb001fd671c1a2b3a57e8c6be6b9e8cebbb0bbd81187b98
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C8 5684 bytes
font_01_sfnt_off00007d12.bin
19acae300a473520e366fbf823c19d0adc000bdef61a44e6cbfb358bf58f0cbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D12 10148 bytes