Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c70bc27fa40f11…

MALICIOUS

PDF

52.4 KB Created: 2020-08-31 11:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef82847c624fa6bd0ce2309bdca167c3 SHA-1: b1ae696097ab29f4f3750942f55bbb8053af238f SHA-256: e7c70bc27fa40f11233e5fca399d707d7a61456f77d002cca6e49fe42e79bba8
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded URLs reveal a link farm strategy, with a primary malicious redirector and numerous links to benign Shopify-hosted PDFs. This suggests an attempt to obscure the malicious destination or to leverage SEO techniques for distribution.

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=http+%252F%252Fseriesbus.+com%252Fanime%252FDrag%25C3%25B3n-p
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/57091042717.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/92975661837.pdf
    • https://cdn.shopify.com/s/files/1/0438/1147/1522/files/pujunikebepozunuwopar.pdf
    • https://static.usrfiles.com/ugd/76156b_97932d4bade84a5392900f397f1bb83c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e4e2a1d621446939847d2da4ef603dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_684aa52f1b41443ca46dc2677abb7ac2.pdf
    • https://static.usrfiles.com/ugd/2b25e8_c867478a0cc04c089a7915deb027be4d.pdf
    • https://static.usrfiles.com/ugd/3fc21f_c088a7bcdcbd4583a8dad0af85c0df7a.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4325/files/65335277075.pdf
    • https://cdn.shopify.com/s/files/1/0437/0645/0074/files/25501077641.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0440/6460/4310/files/gauge_theories_in_particle_physics_volume_ii.pdf
    • https://static.usrfiles.com/ugd/906e9f_d5a86e2ab6aa4a7a8a2ee60be484cbcb.pdf
    • https://static.usrfiles.com/ugd/90c678_a04214efadfc46b2b0353aafd112f6e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60093e7798a448c8da43e3c348c9671.pdf
    • https://static.usrfiles.com/ugd/de02f3_ee0fdd65f0ec4b99a55b41de19b9cd84.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_off00007cd5.bin
e3c66a09d0450fc3faf1b948b6320512e3d23de2f744eff537feddcabcf736a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 4128 bytes
font_01_sfnt_off00008b47.bin
95065d71d9c8addb8675a66871c44d2204d1329814e466fd258fdc1b2658272b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B47 5652 bytes
font_02_sfnt_off00009e36.bin
126dde93ec1c4a07b1bfc829f47aa39d6e315a941396b79e1a2e84305b344dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E36 10608 bytes

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