Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ac95ef1596ce4b…

MALICIOUS

PDF

41.0 KB Created: 2020-10-31 21:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59914262443ec9285b38533e437a3dd8 SHA-1: df646d64442e6cec6ab9e45edecc35511c9eb9f3 SHA-256: c2ac95ef1596ce4b418c079200961c7fe5dfe9560c9d1fea74a27e65cda18800
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL suggests an attempt to lead the user to a harmful site. The document body itself is largely unreadable, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/123?keyword=2+look+oll+pll+algorithms+pdf In PDF document text
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/616e8a5ba74a.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/8016999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f88042f1cf6a.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/dubuz_medewaxemimat.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/4e415f56955a0a0.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/6855149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f9126c192426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f8de9d003835.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/tidivobinimigip-banez-batipafon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8906/0551/files/ascended_weapons_guide_gw2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0713/0786/files/select_in_sqlite_android_studio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0826/1795/files/rittal_product_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/72661547718.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EE 5556 bytes
SHA-256: 1d977042d193b951f9ae7bbf34f690f06662c2abe2adc8b47aee9ebc9605ba94
font_01_sfnt_off000073ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AE 10512 bytes
SHA-256: ed3e2175a8062a9a207afa00b7e7b878660f0772383147102e3c65774c01e427

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