Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a083a3bc918a23…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 07:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b13b1a56affca34971ae5819c6e0dff SHA-1: 66ea60d6956db2a867cdeec806fb3d6d1f88d533 SHA-256: 73a083a3bc918a23f59d4f2ac63dff2e895c79d365e4c4ebb4c978a08d2e524a
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a known malicious redirector at `https://ttraff.ru/pify?keyword=easy+worship+background+loops+free`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=easy+worship+background+loops+free
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/tepemalug.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/pakuxoramixeret.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/pudivovazivowemazo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1694/3778/files/78254516156.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/elementor_section_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/representation_theory_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0435/4097/1674/files/tewagavewuwepobitu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/komesas.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/tosibugenafa.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_off00006068.bin
d193cbb282ff98055b49e27885f7ab9ddcd0c5784d6c9714fc89e3577f224ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5772 bytes
font_01_sfnt_off00007420.bin
b3d78031f6a8d5b08506402728d7fa739d794172823d0cd74bec5305d8cc1b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7420 10100 bytes

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