Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ced122763c43f5…

MALICIOUS

PDF

36.1 KB Created: 2020-08-12 14:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c82c421cc66b3247bbea3b0f256f1ed SHA-1: a75dbd496b60e721c0f8a9c1d138188a031e62d7 SHA-256: 83ced122763c43f5bfe6922b47f444009f42de7e55f6cf956dfdf3584f150d5f
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, includes the text 'Berlin conference worksheet pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.cc/pify?keyword=berlin+conference+worksheet+pdf
    • http://files.camel-excursions-morocco.com/uploads/1/3/2/3/132302872/bugugalikuduz-lijifam-puwaxudu-kedodebapopup.pdf
    • http://gawog.investphilippinesindia.org/uploads/1/3/1/3/131380755/2129473.pdf
    • http://files.cupe1858.org/uploads/1/3/1/4/131482882/misuvedavezubo.pdf
    • http://vijuf.cocon-interior.nl/uploads/1/3/2/3/132303035/1257603.pdf
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/70839443894.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/12332001952.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7360/files/holt_physical_science_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/bases_de_datos_sql_server.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/pazuvawizesivepufijokefel.pdf
    • https://cdn.shopify.com/s/files/1/0435/5427/5479/files/ravefapiburo.pdf
    • https://cdn.shopify.com/s/files/1/0450/6199/6694/files/les_principes_de_l_agriculture_durable.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2270/files/watakibukapoxad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/75639062552.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9783/files/cfa_level_2_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/62055312276.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/possessive_nouns_worksheets_grade_4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005021.bin
5ea8f50de700856f59e9f40070ffb6d6e7d5404772ec484986481183333b1213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5021 5240 bytes
font_01_sfnt_off00006200.bin
e78069828731250545255d07da8d47704abe8eb4b4be990ce058ff14a84fd4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6200 9800 bytes

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