Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc38cc9bcab9d40…

MALICIOUS

PDF

98.4 KB Created: 2020-08-09 23:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23debbf3632c77e89e599530e2cc6c00 SHA-1: 82c40f9bd823916c37276ac354791de741827923 SHA-256: 6fc38cc9bcab9d40833791c740410664eaba6f624430c3505afed3f0f921e793
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=cbc+test+normal+range+pdf'. Additionally, it exhibits a large number of external PDF links, suggesting a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious redirection attempt, likely to facilitate phishing or malware delivery.

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=cbc+test+normal+range+pdf
    • http://files.jadmag.org/uploads/1/3/1/8/131856602/01b62ec05c.pdf
    • http://files.bigsisterschicago.org/uploads/1/3/2/7/132740978/zojuduv_dalebivuxig_gumekexak_tipanunisevit.pdf
    • http://files.coaching-planet.com/uploads/1/3/2/8/132814276/lebumujajofo-dewitupekaja-mozofaw.pdf
    • http://files.jarryjornopublishing.com/uploads/1/3/1/4/131454352/pimoful.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/convert._pages_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9288/files/sogujof.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7347/files/94474486686.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/desugewojasobifujezuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/basic_language_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/98570598377.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/jonado.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/falewivigukenafikegara.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/vapobi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/levojutini.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_off0001451c.bin
edbded0539caaa440ff755d172ce09ea130fc2b636bdb5471ae0453322f1c9d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 5520 bytes
font_01_sfnt_off000157be.bin
84aad0f05d18c50107fc610f32ca22529512674286da9eea649fceb082fdac5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x157BE 10828 bytes