Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6383af8d2b71ea…

MALICIOUS

PDF

59.8 KB Created: 2020-08-09 16:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80e91d91a4a70f71a1b78d66699dc64a SHA-1: 1bc2a4ba594abe97bf47991a9528332db211e81b SHA-256: 7a6383af8d2b71ead6d971719f330a42f406fe473ca9a26dc0545d31e9469dbe
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to suspicious or unknown domains, and one specifically to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that suggest a link farm or SEO spamming tactic, aiming to drive traffic to malicious infrastructure.

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.com/pify?keyword=allegany+state+park+map+pdf
    • http://files.internationaleconomicsabroad.com/uploads/1/3/1/6/131606069/2773374.pdf
    • http://files.covingtontownship.com/uploads/1/3/1/4/131453354/f7c069767280e.pdf
    • http://files.coastalbeachestherapy.com/uploads/1/3/0/7/130740213/rafezikitefor_lapenogeruze_muteniwe.pdf
    • http://rukedomot.lesa-grc.org/uploads/1/3/1/6/131606260/xowenu_sadomesidu_nupagekag_goluzesipotap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/mustang_mtl16_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0667/9447/files/gazofoxokibevedevap.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/rapewunituwukibetawuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/cosmic_rays_and_particle_physics.pdf
    • https://cdn.shopify.com/s/files/1/0429/3672/9766/files/74439322948.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/nenipozorixegogofekos.pdf
    • https://cdn.shopify.com/s/files/1/0432/8177/6795/files/best_ebook_reader_app_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/29301710087.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/vunapujisewid.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/56964573319.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/jixusipajonesorerudegosi.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_off0000abd9.bin
93c452baef8722d826cc7635597b86d709f1d7f6e485e675e52303d9fc1525b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xABD9 5516 bytes
font_01_sfnt_off0000be98.bin
805eab55ffcb629838812097270bfc134a2b86ec5c3436f34b077f9af4335406
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE98 10588 bytes