Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d33a547d0c2701d…

MALICIOUS

PDF

51.7 KB Created: 2020-09-04 00:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efed78672b02020eb64c1612275b8280 SHA-1: d68aad18e8c6ca7c40fbffb2fb7530e33438c59b SHA-256: 7d33a547d0c2701d195766d2adf6c4ae0983c2944a80c3798cbe2b1b57313b31
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL disguised as search results. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates the primary URL leads to known malicious infrastructure. The 'SE_INVOICE_LURE' heuristic, combined with the document body content, suggests a deceptive lure to encourage user interaction with the malicious link.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.me/wix?keyword=guns+germs+and+steel+episode+3+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0c8cc8_0bb2d3d7b27242658d117953b628b9c8.pdf
    • https://static.usrfiles.com/ugd/739437_549241d7115f40619aa0cb527ea74d5b.pdf
    • https://static.usrfiles.com/ugd/d55797_1482afcdf00d4d63a70265f1b616ee8f.pdf
    • https://static.usrfiles.com/ugd/3b7182_488f5af0c6444d0e8608390325f1082f.pdf
    • https://static.usrfiles.com/ugd/bae363_9b9617a4683742709b277cbb4c7378d5.pdf
    • https://static.usrfiles.com/ugd/de3d83_b6c144d9f2ec4e408bfd9668c19b3324.pdf
    • https://static.usrfiles.com/ugd/2d1648_69a19f23a2d245a083ba08a5cab11e9d.pdf
    • https://static.usrfiles.com/ugd/35ddae_c2f261803b614ff18d4478ac23f00fe9.pdf
    • https://static.usrfiles.com/ugd/b444d4_72d0a8eec6fd43eea87e011dddf87511.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/dukaropa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/nojupas.pdf
    • https://static.usrfiles.com/ugd/e1a791_a9a47160e6814b4e9d29130fbb19c53c.pdf
    • https://static.usrfiles.com/ugd/9e14ca_ae98ad557b374ad68b1b1afa39f6fac3.pdf
    • https://static.usrfiles.com/ugd/a2e20a_f04375e64c5944269565c4e861b1c632.pdf
    • https://static.usrfiles.com/ugd/07e02c_c60dd755c1d4475db191b60af48e01f3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007de8.bin
cbc2a84c172400a5903efde719a7af057d06cdff118c8cbb2b6b6330eac91b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE8 5448 bytes
font_01_sfnt_off00009064.bin
876563782bbb8e950624c939b83a040390ad438586983d83a1cca2ad8391bc1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9064 10192 bytes
font_02_sfnt_off0000b33a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 4324 bytes

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