Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8ff49c39ac08be…

MALICIOUS

PDF

47.6 KB Created: 2020-08-18 23:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ed4cf5721803ef70a0bcc73c869b70 SHA-1: 429f35e039e5ca10c342b2ffb434f4a5612381d1 SHA-256: 0d8ff49c39ac08be3f89c2a4009f262d4222ad81dc367708cee31fd137f27cff
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, though heavily obfuscated, contains the text 'Psychology trivia questions and answers' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous embedded links suggests an attempt to drive traffic to potentially harmful sites.

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=psychology+trivia+questions+and+answers
    • http://files.jfkjrotc.com/uploads/1/3/1/6/131607063/f92bfee9d.pdf
    • http://turojojen.gmat.amsterdam/uploads/1/3/1/6/131637881/dofupoxobovi_gevebovikofapab.pdf
    • http://files.altswatch.com/uploads/1/3/1/8/131856446/wisibup_nevigoz_sabirov.pdf
    • http://fawad.gwenrobinsonmedium.com/uploads/1/3/1/3/131383708/gobulalekufilo-xarakopewamaxu-pobabike-dasudoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/bozikizotawif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/sonekubivekopud.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/96679185489.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/michael_lewis_boomerang.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/oc_register_daily_crossword.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/estilo_de_aprendizaje_visual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/22512648432.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/48668486896.pdf
    • https://cdn.shopify.com/s/files/1/0452/2465/7056/files/journal_international_about_descriptive_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/2823/4908/files/xatepor.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8351/files/definition_of_earth_science.pdf
    • https://cdn.shopify.com/s/files/1/0440/2901/8262/files/vadijilavile.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_off00006ac0.bin
9e40c6c499008bd57502b6944dc8be5a34281c04ef0f0559512c57d8e6a96f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 5464 bytes
font_01_sfnt_off00007d51.bin
bbf26e037ddd2ce8a498bc15954b052b6df25bcceb40c924d5764ce5ff898f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D51 11096 bytes
font_02_sfnt_off0000a314.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA314 4324 bytes

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