Malicious PDF — malware analysis report

Static analysis result for SHA-256 160532bbb98ebc65…

MALICIOUS

PDF

36.6 KB Created: 2020-08-07 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e35e43109d85aa1c06357cfac2ffb9 SHA-1: 4098c6f9044203d4142408eac279ed6763860852 SHA-256: 160532bbb98ebc6504334ae79201a032d8fdd70a61fe613abefc5ef6e79a11ee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One prominent link, 'https://ttraff.cc/wb?keyword=pictogramas%20para%20imprimir%20pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine rankings or distribute malicious content through a network of seemingly benign documents.

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/wb?keyword=pictogramas%20para%20imprimir%20pdf
    • http://vorases.atasteofbrampton.ca/uploads/1/3/0/7/130775350/2513159.pdf
    • http://files.landmark165.com/uploads/1/3/2/7/132712185/tilidajizigukiz.pdf
    • http://files.losososfitness.com/uploads/1/3/1/0/131071043/juwelikabi-rirodokesaz-pusadenolenaram.pdf
    • http://files.lexivee03.com/uploads/1/3/0/7/130739081/476a9287bcaf3.pdf
    • http://files.mathewschocoruahouse.com/uploads/1/3/0/9/130969475/zonorijoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/gunsmithing_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamefidijuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/kidozutitepebijaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/karelodelulogare.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/99697294003.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/fadidakibak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/sobipatun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4789/files/cervical_radiculopathy_physical_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/ultra_sx_80_furnace_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/mega_direct_link_generator.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_off00004de9.bin
4d6dcfce9cbaa74e854654c0a8daad83e44da819108e5fa231fd8fa6bc5f29fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE9 5444 bytes
font_01_sfnt_off00006057.bin
0b25782504b6972143736c6871a62cfb57b34dad33839d25e35119a0185026f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6057 11088 bytes

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