Malicious PDF — malware analysis report

Static analysis result for SHA-256 861b8d2931920b76…

MALICIOUS

PDF

41.7 KB Created: 2020-08-06 03:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94b60967724c623a983acd44d44f00ff SHA-1: 7027bec1771d5c0f595060c7d31c26ca4ed46dd6 SHA-256: 861b8d2931920b76c39065962f6f8da421ddb45542fe38d19c066c26d8bb5150
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.com/pify?keyword=concepto+de+estudio+descriptivo+pdf', suggesting a lure to external content. The presence of a link farm indicates an attempt to manipulate search engine results or distribute malicious content.

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/pify?keyword=concepto+de+estudio+descriptivo+pdf
    • http://files.lsccmn.org/uploads/1/3/1/8/131871849/5680994.pdf
    • http://files.genuinsight.com/uploads/1/3/0/8/130813325/5750955.pdf
    • http://files.visualsofjessicasolis.com/uploads/1/3/2/6/132681201/f5fe382ce29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/fubak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/67425791563.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/bekosevi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/bobid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7524/7003/files/84783698019.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/tepezesul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/90199379271.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/30362779298.pdf
    • https://cdn.shopify.com/s/files/1/0432/4045/6360/files/todoboxowomuvofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/rosetta_stone_spanish_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/soul_ties_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/59961103889.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/wuteweropora.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/tigir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5745/files/75334984705.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_off000063ab.bin
f23806141e07d8aad7a24b0f975a3db13e5df8700f6d7b0ef80db55df291d4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 4872 bytes
font_01_sfnt_off00007459.bin
41607b2d7ee43b62dcb07eb6d3f03902ff9c04f2f8aa6ed39289912348450bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7459 11024 bytes

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