Malicious PDF — malware analysis report

Static analysis result for SHA-256 715ba2e1b0f2955f…

MALICIOUS

PDF

37.2 KB Created: 2020-09-07 00:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0407347372b469a22e7a2902051f513 SHA-1: 3e0ae2d352c26b6da2275b7101dbbd122caa30d6 SHA-256: 715ba2e1b0f2955fe1fca4bf54c855deaabe566fc631fe69940b2de3db3b8d49
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, masquerading as a user guide. The embedded link `https://ttraff.club/wix?keyword=acer+chromebook+r11+user+guide` is a critical finding, indicating a likely phishing or malware distribution attempt. The presence of numerous other PDF links suggests a coordinated effort to distribute content through SEO manipulation.

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.club/wix?keyword=acer+chromebook+r11+user+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/74910239594.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/ecg_interpretation_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/66581286049.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/86410921596.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/ansible_jinja_template_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/lozorupunobeben.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/adjetivos_en_ingles_comparativos_y_superlativos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/25437703835.pdf
    • https://cdn.shopify.com/s/files/1/0434/9414/6200/files/33892181101.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3109/files/kopafosupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/wiruwupudogud.pdf
    • https://static.usrfiles.com/ugd/e8dba5_e279a841d7224dff8ab566c6e3ac0f23.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c000e4c12a145e98246d6fbf9937f2a.pdf
    • https://static.usrfiles.com/ugd/4b68be_6739969742c1466fab9c476a3714f8c2.pdf
    • https://static.usrfiles.com/ugd/a4e402_587eada399ef434a96a67979ca38f5dc.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_off000052ce.bin
6acc17647d5e84c2c6d9f8929418ab913b025df6eedc3bf53944b5a9a7555997
pdf-font-stream PDF embedded font (sfnt) at offset 0x52CE 5356 bytes
font_01_sfnt_off000064df.bin
7c096042cb8bfe83db6419474fe1f431dd8d0cc1c0d901f042d627bc304d32c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DF 10324 bytes