Malicious PDF — malware analysis report

Static analysis result for SHA-256 480983efc96e201f…

MALICIOUS

PDF

71.1 KB Created: 2020-08-02 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd9bf95e7161255a8c144948c3652f8 SHA-1: 88cbd728ecd6b2653f31d544c213e1fe9c66c897 SHA-256: 480983efc96e201f2d4a57d6445b571cb35d21be2b852b17feafbab2786ea46c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as "Basic discord rules". The document body also contains numerous links to PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for further payloads. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=basic+discord+rules
    • http://files.pinkyminkcollection.com/uploads/1/3/1/4/131453847/gosipuba_delujozezun.pdf
    • http://files.marionnaz.net/uploads/1/3/0/7/130739027/soxitabu-roxetoj-togajawede.pdf
    • http://files.andreafarmeraprnllc.com/uploads/1/3/1/4/131483344/joluvaradum-sofofesileba-tazidojika-dulutuzefirized.pdf
    • http://files.dutchdisco.com/uploads/1/3/1/0/131070762/7db1e8d2a06f5e.pdf
    • http://files.matthewschaff.com/uploads/1/3/1/3/131384656/8659392.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/8948016805.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/75537010988.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/failed_to_save_server._properties.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/wumokenowulivoresozuxuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/2389/1618/files/62747748689.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/situxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/73019668934.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/bedefewozavobig.pdf
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/xogorabolidalerepimesux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.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_off0000d9ec.bin
f61570e206ba3b0d35331adbb3b510362b951ed63d6799a38ff4da18c74d7a89
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 4984 bytes
font_01_sfnt_off0000eae7.bin
c66989f6d047143759135d1c80d05d6b3a79ad0cda5194977a39cc186cc328d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10868 bytes