Malicious PDF — malware analysis report

Static analysis result for SHA-256 751bc895486969d9…

MALICIOUS

PDF

49.2 KB Created: 2020-09-08 05:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 547bd5ae382e891ee75989c4783abb94 SHA-1: 6f82e0902b8cd17e9e81677f7da8576d565e8736 SHA-256: 751bc895486969d9b4ceb8c3f5cf0bd6b540f575933009839154b1ac3e7e857d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body also contains the same malicious URL, suggesting an attempt to lure users to potentially harmful content. The ML classifier also 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.link/wix?keyword=the+human+centipede+400mb
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1600/9374/files/juxasajon.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/xunow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/voriv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7236/3432/files/caccia_al_tesoro_gi_pronta_da_stampare.pdf
    • https://cdn.shopify.com/s/files/1/0435/9693/9427/files/bexoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/pcaob_auditing_standards.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/vejitivasi.pdf
    • https://cdn.shopify.com/s/files/1/0460/0148/8039/files/kreg_jig_r3_instructions.pdf
    • https://static.usrfiles.com/ugd/c1de29_5e9b4edeceed4e2c9589e21f3c42cecb.pdf
    • https://static.usrfiles.com/ugd/2e16aa_71fca393c2cd400da8a6f04dea24f895.pdf
    • https://cdn.shopify.com/s/files/1/0440/9081/8712/files/8304187504.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/six_sigma_yellow_belt_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7345/files/nelson_1865_raintrain_traveling_sprinkler.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/15310145710.pdf
    • https://cdn.shopify.com/s/files/1/0428/4098/1660/files/sociological_criticism_guide_questions.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eec.bin
546e4d1d2c1a4d0b6a2d1413790b847e52efb8a19bd6053c85daf019364732d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEC 5324 bytes
font_01_sfnt_off000060d9.bin
76dc7e65ed7c891e7c6b53256e57baeb80ec3ac524fc3375f8bbd1859284d43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 7512 bytes
font_02_sfnt_off0000790d.bin
9169cb00d17877241127df0c75b46998c777534d6a7aad9347f7fb88b2ff059a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790D 13064 bytes
font_03_sfnt_off0000a26c.bin
3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA26C 16164 bytes

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