Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbf94bc0bb1889d…

MALICIOUS

PDF

74.5 KB Created: 2020-08-29 09:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c47a987dbabaa57d32e12efc0a7831a SHA-1: cf106507e93eccfeafea77999978c6d3a08a62ae SHA-256: 5fbf94bc0bb1889dbff27b4b609a6ac589f6236ed3338ab3f7eaed2e2aa1701b
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. The ML classifier also strongly indicated maliciousness. The primary attack pattern is a lure to click a malicious link, likely for phishing or malware distribution.

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=landmarks+in+humanities+4th+edition+pdf+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ead31749629042c5bea6a0dfa8203bb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d46246278af41a0b8c48b5e2f54b59c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a8e354bc570439ba91e7da8c11c8c9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e4e60300a364766892853ec9bd7eabb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a90dd225c32e41e8af431106ff17fda3.pdf
    • https://static.usrfiles.com/ugd/b8c837_18a59fe4e7c944f888393337cf5f90de.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fd5f18fc24d41349d00c7180cd522d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f68bb4c00cd64a19912674786f0f43a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cb9b79039134e5083039695e08bce25.pdf
    • https://static.usrfiles.com/ugd/b8c837_df68da6304d94b92ae20c9fb782b992e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/assoluto_racing_hack_apk_1._26._2.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/runasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/sufavizepoxujiravoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/arabic_calligraphy_art.pdf
    • https://cdn.shopify.com/s/files/1/0454/6048/8350/files/accutime_watch_corp_cr2032_manual.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_off0000e3ae.bin
800bf9505c931f513693c0b1c7c59b9ba046d55c280601d8e452ed264a9cd812
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 5344 bytes
font_01_sfnt_off0000f5b3.bin
1526cce0a9099a79a46bb0edeb21beca206dd2d4fce8c83952135bcb184db2b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 11456 bytes