Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9faba59bc6e472…

MALICIOUS

PDF

49.3 KB Created: 2020-08-10 09:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ddd4fc29328543637dc90791c0ccb6 SHA-1: cfcea992caabceccb3622958ff19a484cf9e2e52 SHA-256: 5d9faba59bc6e472ac1fd8b4cbf48c400f04e2459f09bd53b668bcae9810d3e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'answer key' and a URL that aligns with the malicious redirector heuristic. This suggests a phishing or scam attempt designed to lead users to 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=membrane+structure+and+function+pogil+answer+key+pdf
    • http://files.post111stl.com/uploads/1/3/2/8/132814048/ralijesagewog-wobelev-kisixidipu.pdf
    • http://files.maddiebooks.com/uploads/1/3/1/6/131637854/3548936.pdf
    • http://files.frankieneptune.com/uploads/1/3/1/4/131453784/c8674e92c78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/32125627435.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39646295774.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/13345657881.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/20587801337.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/wuwamam.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/vunawutumozox.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/fajuridavojiwinabupoveko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/resistencia_bacteriana_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/zabixefitofebak.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/create_drop_down_list_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/conway_functional_analysis_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/52310941432.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_off00007416.bin
9c0ff46e1336d8c09092eeee13bcc875d54997557692949a11dff9056aad8e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 5760 bytes
font_01_sfnt_off000087a7.bin
b865f34c5f685d8d3fcfb234f0ff65a9d6c422305d2e7423d6fc0395b77a4b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A7 10008 bytes
font_02_sfnt_off0000a9db.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DB 4324 bytes

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