Malicious PDF — malware analysis report

Static analysis result for SHA-256 78245abd39955d4a…

MALICIOUS

PDF

39.7 KB Created: 2020-08-18 19:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c2757d81ebac8bb784ff90224ea1aee SHA-1: 316e7bfa6470727d918be016a051c03d1d14676f SHA-256: 78245abd39955d4ae2244fa991fc3866674a44549a42306221de19ca2ba424c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=annual+report+status+nj`, which is presented as an 'annual report status nj'. The document also hosts a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful content.

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.cc/pify?keyword=annual+report+status+nj
    • http://files.hopewellhub.com/uploads/1/3/1/1/131164275/cae5b68.pdf
    • http://files.adesign.ltd/uploads/1/3/1/4/131437612/kuvenumomu.pdf
    • http://files.kswiftdesigns.com/uploads/1/3/1/0/131070291/desodav-tulatagapiru-dikizimewabap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/dark_souls_board_game.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/jeppesen_airway_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/supasabuxatojitezawaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/fevaxivogugatafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/87625140389.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/bsc_computer_science_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/gupifumegaxupubere.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/xapito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88490435411.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/xojunigofolipejix.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_off00005db1.bin
55ab88ba8ce85eea05c0d3323178260e539490dce91821589eb651a658c5c2c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB1 4880 bytes
font_01_sfnt_off00006e4f.bin
08a0cdbdc4ad3dd61cb9793768487d3645949232b05c62e3657925e69f86a857
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4F 10472 bytes