Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b91ba3e1bcac1d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 19:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325203eaacf8f7d72971cfb18043c764 SHA-1: c5014b4898525c61e4cbeb0c0ed694124593a6a8 SHA-256: c7b91ba3e1bcac1da8ba592c2264745a03925bcb1c14a359c897c839cfed6cf0
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body also contains the URL 'https://ttraff.cc/wix?keyword=hungry+shark+viyaza', which is likely the initial lure. The presence of a mass external PDF link farm further suggests a malicious intent to distribute content or redirect users.

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=hungry+shark+viyaza
    • https://static.usrfiles.com/ugd/0bcf16_66d823f4871e44d0979c69c457fcee1e.pdf
    • https://static.usrfiles.com/ugd/5ecadc_f1242266fe634e7e83730fc377e50abc.pdf
    • https://static.usrfiles.com/ugd/b8c837_c92483f654da4abebf15557d295bfa6a.pdf
    • https://static.usrfiles.com/ugd/ecec20_424bc82eb0bc4813a84eed12d2b8a21b.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/bonfiglioli_catalogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/2nd_conditional_game.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/amoeba_sister_meiosis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4006/3143/files/65238422196.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/43932630798.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/critical_path_template_xls.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/zte_axon_7_review_android_authority.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/rinatunokevajulexalowit.pdf
    • https://static.usrfiles.com/ugd/191a6d_45bd69751c8a4b53ab2f40096865a0e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_be614cb940534a99ba493049139c3711.pdf
    • https://static.usrfiles.com/ugd/b8c837_060f67faf6074162b371c8e9907f299d.pdf
    • https://static.usrfiles.com/ugd/9374a7_c9253163e4de4921abc71a61854fe4f2.pdf
    • https://static.usrfiles.com/ugd/06497e_aa4b09ca148d48d59083cc2a2d465975.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_off00005398.bin
14b964b17a238243d551cadce3f25d4e0c82f1452cd358195ab14ae31644caee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5398 5152 bytes
font_01_sfnt_off0000651c.bin
3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 2140 bytes
font_02_sfnt_off00006ef5.bin
e20bd3ef950d026d19a51a23abdffe64235b7198cf102d383fcd6629ae711728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF5 9696 bytes

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