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) First seen: 2020-09-24
MD5: a5ac23019a00f086218d52f06a9979a4 SHA-1: 1580ecd7b978eb37a065fbb06846fab76a318b49 SHA-256: 51d4bc3e1e0d4614c503931439497eb0e3052c5e8f0b4b4b29235448030e19d0
184 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 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 In PDF document text
    • http://files.cafe160order.com/uploads/1/3/0/7/130776104/446dc5f5fe398.pdfIn PDF document text
    • http://files.margitsacademy.com/uploads/1/3/0/9/130969709/fodipikejur.pdfIn PDF document text
    • http://files.umbrapoodles.com/uploads/1/3/0/7/130775752/7259487.pdfIn PDF document text
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdfIn PDF document text
    • http://files.aboywholovestrains.com/uploads/1/3/1/0/131069910/8897443.pdfIn PDF document text
    • http://files.ghouliesmovies.com/uploads/1/3/1/3/131398250/602f26150.pdfIn PDF document text
    • http://files.onyxfuneralplanning.com/uploads/1/3/1/3/131380413/pofadajigivep.pdfIn PDF document text
    • http://files.furkidsboutique.org/uploads/1/3/2/6/132683173/wuwaxobisag-sosiniwefo-kezopelanopoma-rubid.pdfIn PDF document text
    • http://files.frankhagancontracting.com/uploads/1/3/2/6/132681404/zatamutofineve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://segemabo.files.wordpress.com/2020/06/69011209846.pdfIn PDF document text
    • https://rimusexuxa836038582.files.wordpress.com/2020/06/10791194682.pdfIn PDF document text
    • https://xawuzebufo.files.wordpress.com/2020/07/sojuwimev.pdfIn PDF document text
    • https://didejemaba.files.wordpress.com/2020/06/gubiwawol.pdfIn PDF document text
    • https://kapavefewo.files.wordpress.com/2020/06/fanetugedunus.pdfIn PDF document text
    • https://dasinejufefu.files.wordpress.com/2020/06/dojomaxirojo.pdfIn PDF document text
    • https://vuxisoso.files.wordpress.com/2020/06/dipudalalib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ralaguguzovepusumizus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5664 5700 bytes
SHA-256: 8a08030d6cad547e7ea914c157f790244f7358026f6d706ba79d560cf395a897
font_01_sfnt_off000069bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 9460 bytes
SHA-256: 7babf5911a618ce46349af859fc42f94dc9ef884a05e61664cd00e0a84cd6afe