Malicious PDF — malware analysis report

Static analysis result for SHA-256 de268c6f3e14c8cc…

MALICIOUS

PDF

33.7 KB Created: 2020-08-31 08:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a5b2989e0e6835ca15e662b34e3e22 SHA-1: 4539b27fbb900d319aa8cdf46ffed0fd42bef2d7 SHA-256: de268c6f3e14c8ccb1622587909692f455ef1c98ebfcd41186251bc925964f67
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a "Gopro hero 3 instruction manual pdf". The primary malicious URL identified is https://ttraff.cc/wix?keyword=gopro+hero+3+instruction+manual+pdf, which is likely used to redirect the user to a further malicious destination. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic.

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=gopro+hero+3+instruction+manual+pdf
    • https://static.usrfiles.com/ugd/33ab24_a4fd3302024f447d997a2b1a402f4dae.pdf
    • https://static.usrfiles.com/ugd/32acb1_396fcdce15d34969bd334ed1c4e56c7e.pdf
    • https://static.usrfiles.com/ugd/1e32c2_e1037e8628b543618c7e54d5fdf025f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0e989ece0c043408877d2cb320f75f9.pdf
    • https://static.usrfiles.com/ugd/ae059d_9aa8d89452274a86a539280f13d9ca06.pdf
    • https://static.usrfiles.com/ugd/3b7182_9e61f6b007ab4482b5145d192e788b24.pdf
    • https://static.usrfiles.com/ugd/b8c837_51521f4695354da0bc1311c5a943426f.pdf
    • https://static.usrfiles.com/ugd/b8c837_80b834759d2c4e9b943af6c63b8f4b64.pdf
    • https://static.usrfiles.com/ugd/c3f88d_b58bd49d764a41438cb3340b21a4f3c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_60aaee2e208e4dbaaa5c02bb66bc77a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d87134b51c754a6f99a83597c7862a2f.pdf
    • https://static.usrfiles.com/ugd/4f270c_bb600599d6d342ad8761ad11392fb5b6.pdf
    • https://static.usrfiles.com/ugd/accd1f_785dff3e648946a6bb125198af69de5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc759c359be643d1a5467d6609002bdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/english_grammar_book_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8193/files/xatube.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/nurullah_etin_roman_zmleme_yntemi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/buxegivisi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8067/9577/files/pugazadod.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_off00004820.bin
e8c39f7574af2337b25eb9fc53feae0bf5bcfc9ad50fa342fbb52e26f355f841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4820 5588 bytes
font_01_sfnt_off00005afc.bin
d7da6ed7902ca2ee60be7932968ea2501323728e26b00121c7208b9148a42db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFC 9028 bytes

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