Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76b47fc60d1821b…

MALICIOUS

PDF

41.5 KB Created: 2020-09-02 14:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ee6583c61ebe36175fd3d7f7dcd242 SHA-1: 07732405e6c790538559fbefc3ab2cceaeab42c7 SHA-256: e76b47fc60d1821bcf963f72f0249d4621950cd00ac49301c9658b916ab46185
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Hellfest imdb parents guide' and the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass external link farm.

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/wix?keyword=hellfest+imdb+parents+guide
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/katezez.pdf
    • https://cdn.shopify.com/s/files/1/0464/9854/5822/files/checkstyle_jenkins_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/7854/8630/files/24322819754.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/lopunapulodagolabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/varicela_en_los_nios.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/negative_prefixes_to_form_antonyms_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/windows_7_ultimate_32_bit_2019.pdf
    • https://static.usrfiles.com/ugd/c1615c_9d88a18f56a34179a2c6a10abca0d9d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_656e513a77274f1c97b5d609382164e4.pdf
    • https://static.usrfiles.com/ugd/9a242c_6a92548c4d3a484e99497f8829ebba6a.pdf
    • https://static.usrfiles.com/ugd/5a4aad_c65c858499eb43d4ae543037dc448d1c.pdf
    • https://static.usrfiles.com/ugd/ae15ca_30770a1713b54c8da79300bf7198ddec.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/skyrim_revealing_the_unseen_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/zatofogedepugevapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/mc_patcher_1._9.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/zevalajizokixuvizarukaxor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/master_handbook_of_acoustics.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_off00006445.bin
dfbf02f49c1e4e4007432bbdf40e42c150a506001fddda96cf548542706552ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5464 bytes
font_01_sfnt_off000076b5.bin
5a61dd0e72cea3742d48f8fdaf358bd69f8db530631f62316c4ebc9abd16b4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 10072 bytes

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