Malicious PDF — malware analysis report

Static analysis result for SHA-256 32866b309c449a94…

MALICIOUS

PDF

33.2 KB Created: 2020-07-10 13:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 79145d8e2b8023043ceec8791231fa74 SHA-1: 3901f87237ca6e9cda0327e0430040976a3647a2 SHA-256: 32866b309c449a949946e269b1d2a0514afba0ebcbde2c3e62aa5b70c3045fc0
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'primary colours worksheet'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages. The presence of multiple PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious 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.cc/wb?keyword=primary%20colours%20worksheet In PDF document text
    • http://files.tlcacademyofdance.com/uploads/1/3/1/6/131606368/208d766d5.pdfIn PDF document text
    • http://files.pauldew.com/uploads/1/3/0/8/130874451/2472796.pdfIn PDF document text
    • http://files.livingstongospelhall.org/uploads/1/3/2/7/132712199/kerajenilube.pdfIn PDF document text
    • http://files.nmpstag.com/uploads/1/3/0/8/130814674/3497978.pdfIn PDF document text
    • http://files.aliciapettit.com/uploads/1/3/1/3/131379951/6295262.pdfIn PDF document text
    • http://files.sleepybrook.com/uploads/1/3/1/4/131453394/e83ba56bdcbf0.pdfIn PDF document text
    • http://files.thenestinlynden.com/uploads/1/3/2/7/132712326/xaxubusonakeg.pdfIn PDF document text
    • http://files.kenchungkachun.com/uploads/1/3/2/6/132682063/jisin.pdfIn PDF document text
    • http://files.kmphotographyma.com/uploads/1/3/1/4/131407165/1126974.pdfIn PDF document text
    • http://files.mka-remix.com/uploads/1/3/1/3/131384599/zojeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xabofufutin.files.wordpress.com/2020/07/zazevorakumupad.pdfIn PDF document text
    • https://bafataminame.files.wordpress.com/2020/07/sokigamew.pdfIn PDF document text
    • https://larusepami.files.wordpress.com/2020/06/jubavuvemevikeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24413790208.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66264102559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokukivovasogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27622062760.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x471D 5076 bytes
SHA-256: 453953736b8daacef9cc0fbba1cdeba7a6bea11e38ed961d0f6dc8018661a213
font_01_sfnt_off00005868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5868 9304 bytes
SHA-256: d0685a28a6276526dace1635e8bb143e062ae07e6244aaca68495611bfd6ad67

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