Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa1f4d9a862cc1f…

MALICIOUS

PDF

45.8 KB Created: 2020-08-29 05:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d94627ef255c684d96f9b048e13fb102 SHA-1: 4bb4fda144171c461c13a91e8ba7cd3dc8a16448 SHA-256: faa1f4d9a862cc1f9efe7272432d5e6295c23fd1d467fa595ea209fea89d31e6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm designed to lure victims. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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=rust+elite+crate+locations
    • https://static.usrfiles.com/ugd/b8c837_cf674706d11f43ea869427b2b2bc124f.pdf
    • https://static.usrfiles.com/ugd/b8c837_088496f877554fc7baa16a55277a884e.pdf
    • https://static.usrfiles.com/ugd/b8c837_356b15b450b24591b0eb03bcefb11b74.pdf
    • https://static.usrfiles.com/ugd/b8c837_404531e346b44571b85ab469ac98a2ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ca48d9cf1ea42d6b622902e88f03f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_556f5ec37c0d4b2c80e03d32bba77fd4.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/ncert_class_12_chemistry_biomolecules.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sedetifowakesefo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1076/6486/files/bootstrap_4_form_center_of_page.pdf
    • https://cdn.shopify.com/s/files/1/0440/6755/3430/files/guidelines_nstemi_2015.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e2332e9d968435c90a88c7900c7f6ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e1e337cd6fd4260911a757f1980cbd0.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_off0000784a.bin
2b3ab66ebfb54ecb68abd5155145372fc34ac23fe0917a841f9cd20e01c057b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 4800 bytes
font_01_sfnt_off000088a3.bin
59f89ba93bce7185dfdbf8df199a24f9288149098c2b0569ce4760833fb40c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A3 10008 bytes

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