Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c185da7f7a35edf…

MALICIOUS

PDF

45.8 KB Created: 2020-08-30 23:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 289590a8fe9f346c6105a977668deec3 SHA-1: 8f5d935bcfe33e8b6c7189e2b17ef2b79a8aa685 SHA-256: 3c185da7f7a35edf72f0ca055dfdc4d4b52067e73f2a13ba945aca6f13d799d9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=mechanical+engineering+interview+questions+and+answers+book+pdf', is designed to lure users into clicking it under the guise of downloading a book. The ML classifier also strongly flagged this PDF as malicious.

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=mechanical+engineering+interview+questions+and+answers+book+pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4179/files/canara_bank_credit_card_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/noes_bsicas_de_mecnica_automotiva_senai.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/larilu.pdf
    • https://static.usrfiles.com/ugd/b8c837_14d2ad49b4374aca9468dc11e86e9712.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde0e5f9ecf94f0f8fa19f126ef7d74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cb22a747ba14cd59e1762af545997dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bee09a4693b4a918a656957d88435fe.pdf
    • https://static.usrfiles.com/ugd/374ce0_c0bd45a4a55d459c966193d0e49eed04.pdf
    • https://static.usrfiles.com/ugd/3bf302_c771fd6f8eba469c86b7e8c3619e1040.pdf
    • https://static.usrfiles.com/ugd/b8c837_36015bfecebd4de887802a544476f7cb.pdf
    • https://static.usrfiles.com/ugd/77941b_c5d608a6524e482da9ed4e77860da09b.pdf
    • https://static.usrfiles.com/ugd/7603ae_657ec6d9d8834536991cd6239b5d12da.pdf
    • https://static.usrfiles.com/ugd/4c76bf_cc1341f6ff9442bcb01676d49d8f98e0.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/technics_sa-_dx950.pdf
    • https://cdn.shopify.com/s/files/1/0434/6445/8405/files/17552533180.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/classroom_action_research_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007294.bin
3ee5a212b559bb432cb0b7daf99095fd9c5cd92953f632a21ceb7a76bb5ffe3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7294 5904 bytes
font_01_sfnt_off000086a9.bin
d73ed509057b90759da4083fd16cb9d09692e7b2c63ad5ee8bb575b4df975028
pdf-font-stream PDF embedded font (sfnt) at offset 0x86A9 10352 bytes