Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a91aee217d94a87…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 09:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d285df645fdb82a3cc16fbb0ff5244ae SHA-1: 2e6a7ada915679eb8205e28130f0d30dc831856b SHA-256: 5a91aee217d94a87ea561bcd80ee2e199144a586f8115929cda4b9d6ab7d16f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector infrastructure, disguised as a recipe. The ML classifier strongly indicated maliciousness, and the document body, though partially corrupted, includes the target URL. This suggests an attempt to redirect the user to a malicious site, 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.com/wix?keyword=hawaiian+beef+stew+recipe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_573de9a651c7495696ce73f8c81d8554.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9043a101fb0457c8c2fb8b101a3c8d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dacff84051347828630362e22c5b731.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a7332620b51444ea99b42c5d45787b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_4aa9a5aa9db047bcbef7324ae484cab8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e866402209b4a83b948a68f0bf0a07d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d59cec74088c4297bda894a3449ecb75.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ae5b9fda44486e9c06b3ae4c9525ad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/lavinibimususopajawawolaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/6752/3743/files/62205559963.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/github_checkout_branch.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2a7b9e453ab42369fa6184c26b403f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_78dc4acaef3a41d4bac33137316ff669.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6441ce93f14ebc8f5c88d7378ac92e.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_off00006186.bin
84a37de9218605b3ba21721abc06baa9df5cf4da01e373f1f0656837a39fdb6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6186 5172 bytes
font_01_sfnt_off00007333.bin
7407309421832b53662bf5c7563cae82c2b46560cb5a655101786a3e18fbb516
pdf-font-stream PDF embedded font (sfnt) at offset 0x7333 10200 bytes