Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadfb32663a49413…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 21:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28025381819e5a7c9a39900f3ca0568a SHA-1: 548b5b897f429766637b8e99ed1676fdc562e3ed SHA-256: aadfb32663a49413e359379c1a6bf7a757e3f0343dbaf235035628391eef7c0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate documents, but the primary link redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and URLs, including a redirector URL that is likely used to deliver a secondary payload.

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=hsc+online+marksheet+2017
    • https://static.usrfiles.com/ugd/58a813_aba7ae8279464825a92ff5538a2428a8.pdf
    • https://static.usrfiles.com/ugd/79e0dc_343a1104e72d4fa28d12c8221ea5d8b7.pdf
    • https://static.usrfiles.com/ugd/6240f8_5ad91c705c6641ac8d19a578bba35788.pdf
    • https://static.usrfiles.com/ugd/b8c837_455f551428b740809a72f88b29ea7ddc.pdf
    • https://static.usrfiles.com/ugd/10b11f_66783c4af8e649bbba7b2dec68e4511d.pdf
    • https://static.usrfiles.com/ugd/77941b_fdd3e32e07924c6cb874c1ab945db40d.pdf
    • https://static.usrfiles.com/ugd/b8c837_deb879493aa64324a0062f7b02f87ef8.pdf
    • https://static.usrfiles.com/ugd/105a8c_30a6b8884e9e41c2a7459db1bbb2e627.pdf
    • https://static.usrfiles.com/ugd/03ae60_420ce1aed9f645aea58193a3c2238779.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/gobemuzozapuxiluj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/98775272023.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000688c.bin
ecdf1c6c4f62387a5f8c46835579516a588c8556440898bd58498a29055ec1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688C 5472 bytes
font_01_sfnt_off00007aff.bin
5b434879d60e26b4db9aedcc9a6bb9ade76ee8ad104dac7ad979a78282fc8045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 10348 bytes

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