Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b6661457f1a059…

MALICIOUS

PDF

43.8 KB Created: 2020-09-01 13:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d4a2fb5d263da70cbe0e284a0292ac SHA-1: d438bc64218b1805ccd90f46c3b540e6ac5111ee SHA-256: 76b6661457f1a059db211e7961d3304bb127275077c6de8f2de103dc49bd57c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised with text related to software downloads. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firing for a malicious redirector indicate a phishing or scam attempt.

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.com/wix?keyword=adobe+premiere+pro+5.+5+free++softonic
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e5cbe5_bc142702292f4c368f1009af0a0b3c13.pdf
    • https://static.usrfiles.com/ugd/a18aa6_d2f420e9cf784f3a924b886fbf5af6f2.pdf
    • https://static.usrfiles.com/ugd/2ca09c_981064be09c6454cbb9241d838528b9e.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_cc0413e192a6440886837c910241feab.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e0065230e734c89bf394a82127e6c96.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/13804232218.pdf
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/49076673051.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/foxit_mobile_reader_for_android_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/98010534311.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/29416239229.pdf
    • https://cdn.shopify.com/s/files/1/0446/8106/8697/files/zagixobufinamedorewata.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ddf.bin
9ddb091e652ca27d70f702c7a262502cc2438af8bcc6ad1f4f8078fb85e87c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 5344 bytes
font_01_sfnt_off00008004.bin
52da6ffea2548cdd25eb05674f83c6028de76002735e0011a0b355ba35eb4aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8004 10112 bytes

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