Malicious PDF — malware analysis report

Static analysis result for SHA-256 8862bc6459da2fd2…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 20:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1b7201c56fd62542b09d14292c0758b SHA-1: 792fbfb02eefc0f06401f5dea266da7d9acace1f SHA-256: 8862bc6459da2fd29e580773581b3c75977eff224bb8a0939b1868880851e828
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, likely as part of a phishing or scam campaign. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of a link farm (PDF_SEO_LINK_FARM) strongly indicate malicious intent. The document body, though heavily obfuscated, contains the malicious URL and references to driver downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=insignia+usb+to+ethernet+adapter+driver
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6b47f22d383c44318f5f9b9a44a4079d.pdf
    • https://static.usrfiles.com/ugd/d94ae5_d9577c05dbbf462da3e4a8fcae341871.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e24c4e601de24204a0db39e8a4481ce5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ee0e4978d2f4d1aa929704d3dc48fbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecbe5f3d2f834043aba58948919d143d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b417822a35564b03ba660af99120d73e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c4124c12b6e44ecb468ccb43e47b410.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffa8688089a64fd181585a1459adc7e0.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_4529eb319de24fad925ecffc9c62252a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0446/9299/6252/files/color_meaning_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/2270/2999/files/associao_de_resistores_em_srie.pdf
    • https://static.usrfiles.com/ugd/8c0e65_ae7ecc935aa249fabc1a0c4635c725af.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab96afde982e44ff8247b25864394a6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3287f6c608f146e5b9d64f30e8c8d0a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0a919f6f23a4a198c7e1f6e0553bd13.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddb5693a4e1948ef990733007f7e0f32.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_off0000691e.bin
6859fd1ae1bfe9c49837de35a1da546b86458731a57b87757be7c92c0671280f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691E 5324 bytes
font_01_sfnt_off00007b29.bin
28e2f13ff1afe051219f0317f4f8596ca6e4339014b168d7885a3ee43ca3b1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 11052 bytes

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