Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfbecd887fdeac3…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 05:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88af0a303c5c954b05f76427ba82be4e SHA-1: 788db076af9859a6020a021625cda9701d0f4ff2 SHA-256: 5cfbecd887fdeac336ba3905f2bcf8fcecc64ace5c902563a6e52e202232a61e
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 a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a social engineering attempt to drive traffic to malicious sites.

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.cc/wix?keyword=cmos+bandgap+reference+tutorial
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9710/2238/files/23461949833.pdf
    • https://cdn.shopify.com/s/files/1/0465/5310/4542/files/shawn_mendes_camila_cabello_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8039/files/gallup_assessment_westpac_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/16486309905.pdf
    • https://static.usrfiles.com/ugd/b8c837_05428dbbc6964fa4a8105a5196c7ac02.pdf
    • https://static.usrfiles.com/ugd/724bd4_fb5a3d3135014dcd9015c24916c9676e.pdf
    • https://static.usrfiles.com/ugd/7d21c0_7ba4bf98963c4d2ea43537fac453f3dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d22b7b1c7ebd4c4f93e4430c7519d839.pdf
    • https://static.usrfiles.com/ugd/e42ee3_9e20a4bc3eca490b84618e41e34add69.pdf
    • https://static.usrfiles.com/ugd/d162e3_bd6916da91d148468cefc907df771a59.pdf
    • https://static.usrfiles.com/ugd/6a7407_b3d9d1eead6b4dbb9522346d2a11cb7d.pdf
    • https://static.usrfiles.com/ugd/286fb8_e6b193adb5174a59987e9730fc08a0a5.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/1567853234.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/alveolos_pulmonares.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/puxutasefinodivesivubet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/89626186081.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_off000069be.bin
b48377200c18641adf0d1d6bed7fed37001c76bb9761bbcdd1cee928ce17e4bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 5520 bytes
font_01_sfnt_off00007c62.bin
3848d1fb81a9d2b160182ecdf68c3c554c86ae1dd33861125a6ef2331598bfb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C62 10720 bytes

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