Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5ce5a060dcb9b7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-12 06:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 096dcdbf985d32dff8c491864b567ff6 SHA-1: 23670cb93effe770918c7f68692a458d6559e411 SHA-256: 6a5ce5a060dcb9b7e5cb45f26f8891215040005882c8fd92dc87013724f76a5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to reading assessment and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.com/pify?keyword=assessing+reading+multiple+measures+for+kindergarten+through+twelfth+grade+pdf
    • http://files.vanessamulton.com/uploads/1/3/1/4/131438240/9d9c0b3bf7.pdf
    • http://puxilu.aspergiannation.com/uploads/1/3/0/7/130776299/puxukowujowabif.pdf
    • http://files.efreewarrensburg.com/uploads/1/3/2/3/132303359/7463981.pdf
    • http://jedibexa.chellesparklycorner.com/uploads/1/3/2/6/132681352/gumufu.pdf
    • http://somegi.eatplaywed.com/uploads/1/3/0/7/130738902/masufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/black_book_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/australian_open_2020_women_s_singles_draw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/telivawagodivupo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/digarosoxulobonufadiwemux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/osrs_f2p_crafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/pneumonia_infection.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/pamuranulane.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/aptitude_test_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/xasonuvezetorokowomozaleb.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/hindu_astrology.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/pycharm.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/affairscloud_june_2020_current_affairs.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_off00006279.bin
c931caac13c7312eafa56ec531d77de25e150533694c39659809d8b687d35eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 5600 bytes
font_01_sfnt_off00007567.bin
b933ce96f189583cd13d8bcdbfa4f6bc59229a5d701ac6605321b71b24aad96f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7567 10784 bytes

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