Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c18eb67c43c1f…

MALICIOUS

PDF

44.1 KB Created: 2020-08-08 21:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b6eb9c1a7e0175e9f9844439d88243 SHA-1: 3d9ca4815ccee896393b19f2308da0e8630b83a1 SHA-256: 685c18eb67c43c1fd60fb4c17b37d39b98460f76b0cca3ddf694216c95fa7256
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for free PDF downloads, which is a common tactic for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=assembler+pdf+gratuit
    • http://rukeke.olisamak.com/uploads/1/3/0/8/130874197/rozibomoxo.pdf
    • http://files.jovaunholmes.com/uploads/1/3/0/8/130873973/818c81.pdf
    • http://files.chriswalasekaudio.com/uploads/1/3/1/3/131382583/9304881.pdf
    • http://files.naturaltruthnutrition.com/uploads/1/3/0/8/130815137/f6a9e80d50a.pdf
    • http://files.bridgewaterwarmemorial.org/uploads/1/3/2/6/132680860/22630c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6854/5442/files/taribe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/zuwawakawapod.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/70043483281.pdf
    • https://cdn.shopify.com/s/files/1/0434/6386/8573/files/rifemesapevutisigefatazos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6151/files/faxeluseku.pdf
    • https://cdn.shopify.com/s/files/1/0437/3846/4405/files/gst_payment_voucher_format.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/milineninawogiwiviruwuvu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5011/3943/files/bevel_protractor.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/corel_videostudio_x10.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/38339592028.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/67678451318.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_off00006195.bin
5ef36be2eb4f7ed2843d9e77303eeba6aab035334e29d4f4d7b6a86f6e968cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 5156 bytes
font_01_sfnt_off00007313.bin
1b5721b71d4fe5f72c124601b36f54b06db9727a9c8977e9e2a6a444b0620ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 10060 bytes
font_02_sfnt_off0000958f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958F 4324 bytes

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