Malicious PDF — malware analysis report

Static analysis result for SHA-256 605167cd5efbe667…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 22:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1185cac8f9b7f3a15f2905fed25fe5c6 SHA-1: 227a4ffbeb7a1bd0d75b33e86e019c50c0c818d8 SHA-256: 605167cd5efbe6675b14f715fbec3238844edec9ceca06fb12a1867ffe5261d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a redirector URL, which is flagged as malicious. The document body text and embedded links suggest a lure related to scholarship applications, aiming to trick users into clicking through to malicious infrastructure. The presence of numerous PDF links, many pointing to Shopify domains, indicates a link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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/pify?keyword=university+of+cambridge+scholarship+application+form
    • http://kozaw.creativityindevelopment.co.uk/uploads/1/3/0/9/130969742/nawesubimigomug-lifek.pdf
    • http://fagojow.maennersymposium-schweiz.com/uploads/1/3/2/6/132680813/fefafodax.pdf
    • http://files.lutterburnfineart.co.uk/uploads/1/3/0/7/130739039/3163191.pdf
    • http://toxuw.dundeeareahistory.com/uploads/1/3/1/8/131858540/bipeviwubigoreno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/50639165090.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/jedaxedajefoluluwugabev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/46845782323.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/woliperuzege.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/wabamivupuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/13037709270.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/purabejotowozaguxod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/fupadasidikunileso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jexisobipa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648a.bin
f56487d907839efb109ddc52ec741ba36f6ecc61d83beb8007817e24175ad2ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x648A 5864 bytes
font_01_sfnt_off0000785e.bin
e72ccff591b903373805fa974907da9437dd2dbbaf398fdb05f42e653441798d
pdf-font-stream PDF embedded font (sfnt) at offset 0x785E 10316 bytes