Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d4bc3e1e0d4614…

MALICIOUS

PDF

37.8 KB Created: 2020-07-09 23:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5ac23019a00f086218d52f06a9979a4 SHA-1: 1580ecd7b978eb37a065fbb06846fab76a318b49 SHA-256: 51d4bc3e1e0d4614c503931439497eb0e3052c5e8f0b4b4b29235448030e19d0
150 Risk Score

Malware Insights

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

The PDF document is designed as a lure, masquerading as an answer key to a worksheet. It contains a large number of embedded links, many of which point to redirector infrastructure like 'ttraff.com' or directly to other PDF files hosted on various domains. These links are likely intended to lead the user to malicious websites or download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=compound%20sentences%20worksheet%20circling%20part%201%20answer%20key
    • http://files.cafe160order.com/uploads/1/3/0/7/130776104/446dc5f5fe398.pdf
    • http://files.margitsacademy.com/uploads/1/3/0/9/130969709/fodipikejur.pdf
    • http://files.umbrapoodles.com/uploads/1/3/0/7/130775752/7259487.pdf
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdf
    • http://files.aboywholovestrains.com/uploads/1/3/1/0/131069910/8897443.pdf
    • http://files.ghouliesmovies.com/uploads/1/3/1/3/131398250/602f26150.pdf
    • http://files.onyxfuneralplanning.com/uploads/1/3/1/3/131380413/pofadajigivep.pdf
    • http://files.furkidsboutique.org/uploads/1/3/2/6/132683173/wuwaxobisag-sosiniwefo-kezopelanopoma-rubid.pdf
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdf
    • https://segemabo.files.wordpress.com/2020/06/69011209846.pdf
    • https://rimusexuxa836038582.files.wordpress.com/2020/06/10791194682.pdf
    • https://xawuzebufo.files.wordpress.com/2020/07/sojuwimev.pdf
    • https://didejemaba.files.wordpress.com/2020/06/gubiwawol.pdf
    • https://kapavefewo.files.wordpress.com/2020/06/fanetugedunus.pdf
    • https://dasinejufefu.files.wordpress.com/2020/06/dojomaxirojo.pdf
    • https://vuxisoso.files.wordpress.com/2020/06/dipudalalib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ralaguguzovepusumizus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.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_off00005664.bin
8a08030d6cad547e7ea914c157f790244f7358026f6d706ba79d560cf395a897
pdf-font-stream PDF embedded font (sfnt) at offset 0x5664 5700 bytes
font_01_sfnt_off000069bb.bin
7babf5911a618ce46349af859fc42f94dc9ef884a05e61664cd00e0a84cd6afe
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 9460 bytes