Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc7cba45262ed84…

MALICIOUS

PDF

37.9 KB Created: 2020-08-09 07:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a11dcc1cedadd639286fe581090c0ae SHA-1: add5e275eeb72720ec9504fe734cb53deb2e80c2 SHA-256: 7bc7cba45262ed846c997c14260374fd32bcd344e11a147755976f337fd1e689
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a PDF search query and includes the malicious URL. This suggests the document is designed to trick users into clicking the link, likely leading to further malicious content or downloads.

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.ru/pify?keyword=aula+internacional+1+nueva+edici%25C3%25B3n+pdf
    • http://files.pluckersworld.com/uploads/1/3/2/8/132814096/tilemozu.pdf
    • http://zidadof.balihoteltransfers.com/uploads/1/3/2/7/132740214/mixolovometis.pdf
    • http://files.dogsbestfriendcr.com/uploads/1/3/1/4/131454102/7951001.pdf
    • http://files.fullvase.com/uploads/1/3/0/7/130776499/86196f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/lawumuvaguxijuvagedetag.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/yardi_voyager_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/tabaliwakudinugevazevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/61392433591.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/23540815604.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/jofafugadege.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/vubetominuzobosuguxuxetam.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/8027646431.pdf
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/12343915556.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/mejuzupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/angulos_en_la_circunferencia.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/dipetuj.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_off000047de.bin
cd38f85c88e7a8a9d710b292ae8d12af90d3b01df4df78c57f97f31467d206dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47DE 5088 bytes
font_01_sfnt_off000058fe.bin
188cb48f2e1c302063c2b31a569b589e5dd1b64605c3428d08c6bbd35cc1fada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FE 10160 bytes
font_02_sfnt_off00007a8a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8A 4324 bytes

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