Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f016df3b0004f0c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 11:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 738482b11c5d75d139a26a62970c2c27 SHA-1: 42144cc907f0c7c063d4a6b086f427c449784582 SHA-256: 6f016df3b0004f0c13b10c3002f8fec6baf08bd0ccd486ef681a08af52a4884a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site for phishing or other malicious activities.

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=enfoques+de+la+investigaci%2525C3%2525B3n
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/ejercicios_aumentativos_y_diminutivos_3_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/32876239083.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/fevuza.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/adobe_audition_3_free_full_version.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5dc56fb56bc44e4addb632d64f5d847.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_d40006070e584dc2ab9fc3469323d5d3.pdf
    • https://static.usrfiles.com/ugd/0c4177_ca95541818444d5d9509fdd784097e7f.pdf
    • https://static.usrfiles.com/ugd/4c1554_e69d4e9e7578455097efdc9bbc1e3688.pdf
    • https://static.usrfiles.com/ugd/cdb50c_49b33a55554c4d1986f75074b6784821.pdf
    • https://static.usrfiles.com/ugd/4725f1_3431995a043d49709bfc3bf3632a9daa.pdf
    • https://static.usrfiles.com/ugd/9c43ec_36ebef96e8a24321b7b7524538c7465d.pdf
    • https://static.usrfiles.com/ugd/38bf1f_ea7c6eb58fdf4c6883beaeca4735efb9.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_a04e3eb268a3458582ebb704166186d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8801f67e37f84cefb3a1839db9e3e676.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_off00006164.bin
da6aa184bb483ccd123fddf9257e74cfb99e9e776e1c19ff55417b1106415b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6164 5372 bytes
font_01_sfnt_off0000738c.bin
e49be9280932a0b7637fab6198635d91f1109441d15077e611f385bb97c38de3
pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 10736 bytes