Malicious PDF — malware analysis report

Static analysis result for SHA-256 769e7b0cdd6f9b07…

MALICIOUS

PDF

50.2 KB Created: 2020-08-30 04:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4c2690d23718d17e65cb26e7b52d1a SHA-1: f05a58d33fe81195e1773ea9eb9d07f541a9208a SHA-256: 769e7b0cdd6f9b07820d176a823bccc55679c137bda19b47eb53837e8d9a323e
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL that is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to a 'brother knitting machine model kh 551' and a call-to-action phrase, suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links further supports the SEO link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=brother+knitting+machine+model+kh+551
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_827273defede44d1b6180b8bfe373ef4.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_d780a68b68734ac5b1aefa187f05e0db.pdf
    • https://static.usrfiles.com/ugd/99965f_76989b02374742ef8796a4372273870f.pdf
    • https://static.usrfiles.com/ugd/b8c837_879b8725eb8b4873a9972f7b9620de61.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_b6a9fcba1f2542b094d7110985a2d8d5.pdf
    • https://cdn.shopify.com/s/files/1/0460/1400/5415/files/norox.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/nesek.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/dewebipavatiligopemik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/vaforujoburizisizusu.pdf
    • https://static.usrfiles.com/ugd/4ae4db_79fa64374f76481bba19c59268309cc9.pdf
    • https://static.usrfiles.com/ugd/b5472a_b77fb7f3418c4824b41a0ca47d7d1302.pdf
    • https://static.usrfiles.com/ugd/b8c837_f160cccd797b40dc8753f7f406c2e438.pdf
    • https://static.usrfiles.com/ugd/b8c837_c575e52dff6f467181dd5c68f6159dc2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/5490078380.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/torixizamiga.pdf
    • https://cdn.shopify.com/s/files/1/0437/7922/7805/files/kandungan_belimbing_wuluh.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_off0000856a.bin
5bceec4a66a2d4963568fa01a12535d298eaf199d8fe10f887f31d904f9e402d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856A 5464 bytes
font_01_sfnt_off000097d3.bin
a370dfab789fe07bf5bb69f640634b54ebfe4104e01dcc8bd0f38a98301ebe43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97D3 10476 bytes

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