Malicious PDF — malware analysis report

Static analysis result for SHA-256 039baa07dd42f8ff…

MALICIOUS

PDF

50.3 KB Created: 2020-07-30 20:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71a1c92dc6c509ef599914eb361bb8bb SHA-1: 6007d2f1783531421d290099d7ef49e53bcfb09f SHA-256: 039baa07dd42f8ff06ed8f5d00778c8ead9a2b3c7333ae2576c04c55962b238a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely intended to direct users to malicious or spam content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=understanding+pathophysiology+6th+edition+test+bank+pdf
    • http://files.elizabethhrand.com/uploads/1/3/0/9/130969254/milelu_vogelubolup_nikudoderas_xelepipikagew.pdf
    • http://files.sheltiesalberta.com/uploads/1/3/0/8/130874585/9574119.pdf
    • http://files.patricedworkin.com/uploads/1/3/1/6/131637131/391527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/sawufetajos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/53569600934.pdf
    • https://cdn.shopify.com/s/files/1/0435/8147/2929/files/71920936203.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0435/files/zivafapixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/setadijivirevabatowutuzid.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/mapirokejevupeki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/79570992132.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/xokusuruworibedik.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/2479507915.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/4758490605.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/43367695413.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_off000085ca.bin
8b8ec45332e434efdf192cc139b55c782c77977fd23d577be6270bcb509e8068
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CA 5540 bytes
font_01_sfnt_off00009897.bin
1a523b5e69d9e51bd9abb13636c50f7e950992e1368c53131d0e8ffd1136c841
pdf-font-stream PDF embedded font (sfnt) at offset 0x9897 10340 bytes