Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ef3eef7602304…

MALICIOUS

PDF

41.2 KB Created: 2020-08-08 17:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb0360ce1979d6e93ace0d030900573 SHA-1: e1179aa2db931dfb6e757254916df2cc6fe461b8 SHA-256: 833ef3eef7602304f074586e5d13c7be86aec09f417bb1be97b2f64ff954849a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains references to 'action words worksheets for grade 1 pdf' and numerous URLs, suggesting a link farm or SEO poisoning tactic to disguise malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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.ru/pify?keyword=action+words+worksheets+for+grade+1+pdf
    • http://files.sbmig.com/uploads/1/3/1/1/131164239/33b69b918d8.pdf
    • http://files.peterbixbynhhouse.org/uploads/1/3/0/9/130969772/34d15279d10b1.pdf
    • http://jamulakej.balsamrootcatering.com/uploads/1/3/0/7/130776433/6193ce1.pdf
    • http://kefijona.piconservation.org/uploads/1/3/1/4/131408899/6308949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/does_windows_10_have_opengl.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/biodegradable_materials_list.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/61761252027.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2803/files/1826415044.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/zigedenexuzo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/melofufiximolaneg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/tuwolarezufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5526/files/nuvodanos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/algorithm_analysis_in_data_structures.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/vb._net_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/welunazakudidipipedemapur.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/betonalodobepaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/tuduvenukusiwifegijazi.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_off000061f2.bin
ab06c14861d4762e7bc850ab984325aed7eba424d58e1779efdddcdcc9f9148c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F2 5584 bytes
font_01_sfnt_off00007509.bin
b08e876a316b40607d864fd5cd5f323a391df438ff9023bb8ceab94738aea582		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 10132 bytes

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