Malicious PDF — malware analysis report

Static analysis result for SHA-256 19796a041456c70a…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 01:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6352d80dda8f220524b5f4999b56f9b4 SHA-1: c64e6cc2fdcd4ba384e22034afaebc8936c3ff0d SHA-256: 19796a041456c70aaf38a5a9074ffaf642730bc1c7c3bcb592c4dbd2497bb68b
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://ttraff.ru/pify?keyword=coding+guidelines+for+diabetes+mellitus+type+1', is flagged as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly indicates maliciousness.

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=coding+guidelines+for+diabetes+mellitus+type+1
    • http://vudab.bentleygrove.com/uploads/1/3/1/6/131606490/visugepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/goverment_time_server.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/nys_it_201.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/girl_meets_girl_anime.pdf
    • https://cdn.shopify.com/s/files/1/0465/3095/3366/files/82127119637.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5842/files/zigemavikarirupekute.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/sda_african_church_heritage.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/94532908875.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/benim_hocam_ders_notlar_corafya.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_off00006917.bin
cf47f568f084579104ae4535a627ebd2bdb226b3aec3513f24ebdefa79023953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 5560 bytes
font_01_sfnt_off00007bf0.bin
f745b808ed71a88fc49ad89e84bc8879cae7bbee61f8ba30adea5ca7d4ce9c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 10348 bytes

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