Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c3f53462f6cc19…

MALICIOUS

PDF

45.2 KB Created: 2020-07-29 03:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3a35820e4b3f9278c5cc6c466fdef1d SHA-1: 012897f21b750130b5ff1eda6520a44fc56d4e6a SHA-256: 89c3f53462f6cc19ca6e61faff6072bfd8cf8300b9c23729850b8b4f71059a54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, and heuristics indicate it is part of a link farm designed to manipulate search engine results. The ML classifier strongly suggests malicious intent. The document body appears to be obfuscated or corrupted, preventing a deeper analysis of its specific content, but the presence of malicious links is sufficient evidence.

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=rome+2+total+war+guide
    • http://files.wilmingtonprintandmail.com/uploads/1/3/1/6/131637057/cd8bc305482.pdf
    • http://files.globalsafetymalta.com/uploads/1/3/2/7/132740620/lafojejavaxoveki.pdf
    • http://files.sassysewingandembroidery.com/uploads/1/3/1/3/131384113/5667161.pdf
    • http://files.martinluthercampus.com/uploads/1/3/2/6/132681479/7728384.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/29203687195.pdf
    • https://cdn.shopify.com/s/files/1/0437/5281/6798/files/vigotefusisovegejotev.pdf
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/tadizukinipedojasokudelu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/59059223693.pdf
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/48712414282.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/8861132955.pdf
    • https://cdn.shopify.com/s/files/1/0440/6339/1894/files/80311727331.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6324/files/35931742255.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/10632247461.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/defusuwewudoxasif.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_off000074e3.bin
9cfcf2220095dfb60cc54f3bde0480b03d3f81cd9d6b2446dabecdda92a9d915
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E3 4976 bytes
font_01_sfnt_off000085e4.bin
4ba9dc66aca120458dde2d9f7c8983e79aaf9d69a9b983bd911fe61f0bc018aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E4 10044 bytes