Malicious PDF — malware analysis report

Static analysis result for SHA-256 648af7098fd6c871…

MALICIOUS

PDF

44.3 KB Created: 2020-08-24 10:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b15de28fbe8c44046184bf160c9556e SHA-1: 2a2e022dda54e3ab1132e21bf1d271472127600d SHA-256: 648af7098fd6c871b294b7ff30f0e6abcccc3bd87b87f7df0fb2ceb3a81de914
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating an attempt to direct users to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a lure to a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=seventh+day+adventist+exposed+pdf
    • http://bipemu.stlouisfitnesstraining.com/uploads/1/3/0/9/130969149/4ebc43.pdf
    • http://kipetudoz.laviniapennino-architecture.com/uploads/1/3/0/8/130874493/vutavonadiwovumifaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/mibijasofadavewuvo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/historia_de_africa_subsahariana.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2346/files/87425083068.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/gogoxazosubamijawexutafe.pdf
    • https://cdn.shopify.com/s/files/1/0454/3050/5628/files/87857300256.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/56140139758.pdf
    • https://cdn.shopify.com/s/files/1/0432/7348/6496/files/lanupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/25463801699.pdf
    • https://cdn.shopify.com/s/files/1/0433/0858/1019/files/ruvariberazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/gusijiwabidutaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/arabesques_gogol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/38689141709.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_off00006f29.bin
c85f00ca261f27bcf198d9aaa2d67c13b3d0769f6709a78e5be89345eb3f5aa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 5332 bytes
font_01_sfnt_off00008161.bin
e2df01daae177166b67b170ee9185f0e8c38f42c3f9e62e542543b0794e2ab3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8161 10328 bytes