Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efb411f308f3eb1…

MALICIOUS

PDF

48.7 KB Created: 2020-08-24 00:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42ff5303bf589d73984562cef9133a1 SHA-1: 56eac4636622fa0104412c9d71f7bd772df81866 SHA-256: 7efb411f308f3eb1bac2fcd00a8428a123d3dc88a6928884d150aef3ccf4419d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=atom+text+editor+format+xml'. Additionally, it features a PDF link farm heuristic, embedding numerous links, many of which point to benign Shopify domains but also include several unknown URLs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to text editors.

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=atom+text+editor+format+xml
    • http://kovigipa.cleanandleanmixes.net/uploads/1/3/1/3/131380983/639900888c.pdf
    • http://bopareziv.beaconsfieldfestivalofchoirs.com/uploads/1/3/2/7/132741029/notenofukexekupurok.pdf
    • http://files.ppitowing.net/uploads/1/3/2/7/132740214/pojijamowedasuk_dikefawiz_sofojefoz_xiwupozezeb.pdf
    • http://files.courtingkenya.com/uploads/1/3/1/8/131856626/fadesape.pdf
    • http://files.reynoldsyachts.net/uploads/1/3/2/7/132740533/zubufirol.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0826/files/adjective_and_adverb_prepositional_phrases_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/rapidex_english_speaking_course_book_in_bangla_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/history_and_theory_of_architecture_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/7007/6566/files/best_cv_design_template_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8485/8022/files/50292061597.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0133/files/vexenene.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8518/files/xunulenun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/dujanolonep.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/pelil.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006300.bin
2a929712aaad4e807efc91742dc2c400f01f2c9a350e5448af27c2d8ad217b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6300 4932 bytes
font_01_sfnt_off000073b3.bin
26c32793a196a57f971fb828523e137ac76bebed26215f96f991f8b7e0adc5a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 14452 bytes
font_02_sfnt_off0000a14a.bin
fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14A 16084 bytes

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