Malicious PDF — malware analysis report

Static analysis result for SHA-256 1665ea8c947771d7…

MALICIOUS

PDF

55.3 KB Created: 2020-08-08 13:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 558ad002fd0b9020ea73cb32f4a69098 SHA-1: 6070ab5217d21c9947b852ee51a62cfc31c66827 SHA-256: 1665ea8c947771d7377a2f93f7a8c89758a677b485db139bf0f2a4bb672d767b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text suggesting it's an 'application for tc in english pdf' and includes the malicious URL. This indicates a likely phishing or malware distribution attempt, leveraging a link farm to obscure the final destination.

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=application+for+tc+in+english+pdf
    • http://files.newadpix.com/uploads/1/3/0/7/130775448/1642464.pdf
    • http://files.rsitoy.com/uploads/1/3/2/7/132740958/4610470.pdf
    • http://files.hotstuffromance.com/uploads/1/3/0/7/130739190/1965456.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0448/0784/8096/files/estados_financieros_ecopetrol_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4732/files/best_book_to_learn_english_speaking.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/19223830524.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/metajemofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/dujosulijazemezonar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/58162082812.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/8608796369.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/88469224744.pdf
    • https://cdn.shopify.com/s/files/1/0438/2294/0320/files/systematic_combining_an_abductive_approach_to_case_research.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/sap_mm_blueprint_document.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/4726947975.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c3.bin
0c5b4fc218c50072651668d675fbbfc54eb252e5501adbc267965967bbed6682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 5196 bytes
font_01_sfnt_off0000895b.bin
d785ac48596f7cf9897eb5c344706819294a3d975c1ddc88fdcc337f862f3859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895B 10368 bytes
font_02_sfnt_off0000ad05.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 16060 bytes
font_03_sfnt_off0000c197.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC197 4324 bytes

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