Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc2f7fc7029d455…

MALICIOUS

PDF

51.8 KB Created: 2020-08-29 02:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0230588ed919f519417ce81a6962da SHA-1: 1c0b1dd0afa8cad6f819c1d5d8493e543d8b1168 SHA-256: 6fc2f7fc7029d455a6cf6a15a3a53b3626c0a9cc4b34ef7e3a3fa183112e2ff0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=reglage+machine+a+coudre+singer+ancienne', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly for SEO abuse or further exploitation.

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.ru/wix?keyword=reglage+machine+a+coudre+singer+ancienne
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5cdb6847933b43199d51d19747e5f3ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_123168eff3ff4dfcaa9395970eea02cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_042dbe163e634115b5c510bc23381735.pdf
    • https://static.usrfiles.com/ugd/b8c837_f41957d4c934435c9073354f6dd72eb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9a077fd06d433392c193ee7a9845e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e90bf73675f04c30b8fc7ed03ca40738.pdf
    • https://static.usrfiles.com/ugd/b8c837_14cb80bdcb40485c9783e7d101722bf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf8204b084274036b0933a571710e5af.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd485b0c68a401d952a3ca991841d71.pdf
    • https://cdn.shopify.com/s/files/1/0437/8204/5853/files/affairscloud_current_affairs_february_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/amsco_apush_review_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/49384133118.pdf
    • https://cdn.shopify.com/s/files/1/0430/1268/5977/files/48956753280.pdf
    • https://cdn.shopify.com/s/files/1/0437/2614/3639/files/33231337070.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/allen_ginsberg_biography.pdf
    • https://cdn.shopify.com/s/files/1/0428/7312/7079/files/ameba_sisters_video_recap_of_meiosis_answers.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/new_movies_tamil_2019_free.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_off00008cb2.bin
cb4762cb301b87b1590d254bd5b087c53872d0f2bb4816ac961bc8673a1c3294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB2 5360 bytes
font_01_sfnt_off00009ebf.bin
5e6975149ce827046fd919fecfad9e37746b36e779273507da8be17a3de457b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBF 10340 bytes

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