Malicious PDF — malware analysis report

Static analysis result for SHA-256 133fdf367a6f9ff5…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 11:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 693eea57901dff420b349d101bc16c8b SHA-1: b11fb2567a044cc9c630c6421064b0c0b7977732 SHA-256: 133fdf367a6f9ff59d40899d4d9d6d2ab8a055bbe48f5c6009c940cf289b209c
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, suggesting a link farm or SEO manipulation tactic. One prominent link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body itself is heavily obfuscated and contains a URL that appears to be part of the lure.

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/wb?keyword=pesquisa%20qualitativa%20e%20quantitativa%20em%20pdf
    • http://files.scentsiblysimple.com/uploads/1/3/0/8/130813325/teteruwowegizi.pdf
    • http://safewop.vellichorshop.com/uploads/1/3/1/6/131606457/morizarupopafa-mogegi-jazarosagel-suwakixu.pdf
    • http://files.krumbsnatcherenterprises.com/uploads/1/3/1/4/131483719/lerif.pdf
    • http://buvukuf.renmach.com/uploads/1/3/1/6/131606289/9df3178b0a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/fupofixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/timarajoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/jajiwolatorimogud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/xetumewuxatanajifakuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/64682405390.pdf
    • https://cdn.shopify.com/s/files/1/0446/2179/1395/files/pradeep_chemistry_book_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0439/4080/6824/files/37260930470.pdf
    • https://cdn.shopify.com/s/files/1/0439/0728/5147/files/gmat_probability_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0443/8104/4902/files/entrepreneurial_operating_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005961.bin
3fc8dd263ebc19e2c10422d6a580b11727d5daaa543c572f66cd831a00595560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5961 5048 bytes
font_01_sfnt_off00006a76.bin
6dc58230be6f6e81625d216b61bb946466f961ce79d10fedb1d794ef48af918d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A76 11640 bytes
font_02_sfnt_off00008d6b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6B 4324 bytes

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