Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e4df80894ac8f7…

MALICIOUS

PDF

37.5 KB Created: 2020-08-29 01:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef53d3cc109cbb1e66264debd04bc8ec SHA-1: 64c4b138380b121cd1bd3343fed65d0577e6d222 SHA-256: 72e4df80894ac8f7541a5990496ef31463e1a65cafaf95e724a01d6c21275c1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, a significant portion of which point to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the URL for the malicious redirector and several other URLs that are part of a link farm. This suggests an attempt to lure users to malicious sites under the guise of providing technical 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.ru/wix?keyword=rotordynamics+of+turbomachinery+vance+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_005d6b644292442da998f3d4725c3f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2699747050b748e7ad80b161806cd366.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe82880a10074a2c838525e9813570a2.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/6433121781.pdf
    • https://cdn.shopify.com/s/files/1/0437/5461/9041/files/35144536730.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/atlas_of_amputations.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/favidusapabamurot.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/fortnite_to_apex_legends_sensitivity.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/bukapikixiput.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/statistical_inference_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/eating_habits_of_animals_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_359d602c73aa4c8c9fb2095920338b1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdf
    • https://static.usrfiles.com/ugd/b8c837_396629ec99d94ffd808ba9b983161948.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7c1df167c7144dcb2e091af2a92c45b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba881b756674e429f852991f1cceaf2.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_off00005329.bin
66119103fa281417599d77a5aa90c26dd19b08111544b06acbea7fcdefef3b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5329 5672 bytes
font_01_sfnt_off00006653.bin
9c172a2ab1d03c339d5e8139043bb46e922d026232e6db58ae810423e91d4ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6653 10164 bytes

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