Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62e14337fdb1559…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 01:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fbb134ff8dbecfe6dfe7309a9401c66 SHA-1: 982a8c4b712278e07642420cd6fe88115c332677 SHA-256: c62e14337fdb155923511f998dae5c3d1391da0962a57091a679a753e6f9214f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF file contains a large number of embedded links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. One of the primary links, 'https://ttraff.com/wix?keyword=tirinhas+com+ora%25C3%25A7%25C3%25B5es+subordinadas+ad', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be corrupted or malformed, but the presence of the malicious URL is the most significant finding.

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.com/wix?keyword=tirinhas+com+ora%25C3%25A7%25C3%25B5es+subordinadas+ad
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/hope_is_not_a_strategy_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/fusionner_deux_en_ligne_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/pixozeko.pdf
    • https://cdn.shopify.com/s/files/1/0438/7936/6811/files/13680590944.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/parallel_lines_worksheet_algebra_1.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_97a029a66fd24544b63d126a8d883e26.pdf
    • https://static.usrfiles.com/ugd/20d83a_f51b0282f991464b8404ad2a5758fe3a.pdf
    • https://static.usrfiles.com/ugd/6908d7_2b1fcd23c5f149288c10ff26b81926bb.pdf
    • https://static.usrfiles.com/ugd/5be868_554765883bbf400ca309674df398b5ee.pdf
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/rato_de_pas_de_rato_de_cidade_works.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/xomowelobex.pdf
    • https://cdn.shopify.com/s/files/1/0436/6336/0153/files/18027690092.pdf
    • https://cdn.shopify.com/s/files/1/0437/2008/1563/files/building_construction_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/60761408462.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/28263389538.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/36011816273.pdf
    • https://cdn.shopify.com/s/files/1/0447/7186/8821/files/school_application_letter_sample.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_off000065d2.bin
08a01c455eab7f4f277f95373ea4e327f48bb334f76903aa7f04ddb8d54ecdf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 5440 bytes
font_01_sfnt_off00007765.bin
bbd1939b113002a529685f020c9ad8477f9fb8b2abda12c04f79aa030b96e01d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 12280 bytes
font_02_sfnt_off00009cab.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAB 4324 bytes

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