Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dadd5a859d5819a…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 03:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c42b9e148d21ea1dc07202295478b6ac SHA-1: c4f7b8eec17e7813c6497ba2446b9903b82cdc5d SHA-256: 5dadd5a859d5819ae30c746f324ec26f0b5ea9c087f9097149f2a0ece26faf38
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. The primary malicious URL, https://ttraff.ru/wix?keyword=subject+verb+agreement+worksheets+for+grade+11, is designed to redirect users to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to lure users to malicious infrastructure, likely as part of a phishing campaign.

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=subject+verb+agreement+worksheets+for+grade+11
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2276/1635/files/76721466059.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/puvifuj.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/e7_a7_a6_e6_9c_9d.pdf
    • https://cdn.shopify.com/s/files/1/0437/4285/5319/files/tomb_raider_anniversary_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/52236207538.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/after_effects_book.pdf
    • https://static.usrfiles.com/ugd/74e9cf_8300f8c963534e968f6a087af8535cd9.pdf
    • https://static.usrfiles.com/ugd/97493d_55e667417dac43ceb264ed5f7766663d.pdf
    • https://cdn.shopify.com/s/files/1/0463/0754/1149/files/ragezibopefozalob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/gentlemen_prefer_blondes.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/dodiniwiganawi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/bevadibomogasej.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/jdk_1._8_for_linux.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_off00005d8a.bin
4fa58efc3fec35c0c517eef1d234544045757c0b78e97c4b88a6c20a13b7643b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8A 5988 bytes
font_01_sfnt_off000071e3.bin
10f633236a3e5e52ac5ec8e83205ed1c6ec7cbba8ab840970070e3f3aed3ce35
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E3 10324 bytes