Malicious PDF — malware analysis report

Static analysis result for SHA-256 61894876d55984a3…

MALICIOUS

PDF

55.4 KB Created: 2020-08-07 23:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53c094bae847e5e3a4050b92d6178c95 SHA-1: c3adfab255b0186674facbc1311c1c152425e91f SHA-256: 61894876d55984a32f73b9427c1f3e4839b4147dde961afe502f61d3ab614ae0
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=biology+advanced+level+notes+pdf, which is flagged as a malicious redirector. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to 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.ru/pify?keyword=biology+advanced+level+notes+pdf
    • http://files.campbellscostarica.com/uploads/1/3/1/3/131383319/titewenamaz-bolezujiwis-widinote-sofavusalas.pdf
    • http://files.3brothersforacure.org/uploads/1/3/0/7/130740138/8433652.pdf
    • http://files.lifelonglearningpath.com/uploads/1/3/1/4/131437474/wifadozijubadugeba.pdf
    • http://files.thiottawa.org/uploads/1/3/1/1/131164125/doleminimunetud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/43009778707.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/67682212293.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/fusionner_plusieurs_document_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/14709022714.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/foxemowoxovojuledinexata.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/62097645744.pdf
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/calculating_standard_deviation_and_variance.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7173/files/shunting_yard_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/kazeguwibixopewafivi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/39292140685.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/vapikomofolipubakude.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1664/files/budget_2020_analysis_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/case_580_backhoe_operators_manual.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_off00009af4.bin
d70fc0cd5bf34a930c701c14890ebb3264314cb3dca52f8f347be0c27b7c0e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF4 5440 bytes
font_01_sfnt_off0000ada1.bin
d34fbb741040abd548a1b94b3b12932077001fbd97360110da543fc6ecc63453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 10152 bytes

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