Malicious PDF — malware analysis report

Static analysis result for SHA-256 131ba0a65637d7ad…

MALICIOUS

PDF

57.0 KB Created: 2020-10-16 05:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 36f600519d6dfdf91922ad5a745f53a2 SHA-1: 789622c40f8995bd0f5f889b08d7d973356043b5 SHA-256: 131ba0a65637d7ad6d2802c643a3cede82fd75eac2c61182366765e52d31e175
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/123?keyword=miui+11+launcher+apkpure In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8730c5b4cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8847a6d5396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f874c8f36bd2.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/degiduxuxut_jofabamukok.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/46ce80b10ff.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/filosom-lusiwikafese-jerupuxorukoti-novubolifunuw.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2daec3eb3c.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/monirafulowafix.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kadupe_ripovu_jozovagazemewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f8801aa4880b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f875b29650f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f87f38c6d2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f871378c96de.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/1/0481/0080/2723/files/18837156793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8835/1910/files/tamil_alphabets_with_telugu_translation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6505/7695/files/pixaxolujidaxufeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1674/4870/files/introduction_to_procurement_and_supply_chain_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8924/1258/files/andrew_carnegie_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47302996-5c8e-4cb1-8e1f-505142a4f2c1/nodalasu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E18 6676 bytes
SHA-256: bcacc121fcc738d95eaaff3f8ce2e8aaf14b93daa216cb17ffef69596c49c031
font_01_sfnt_off00007ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 4964 bytes
SHA-256: a3950d578e31ded8613c834bfec92f5d2792647a4f3658b7a738f2957307634a
font_02_sfnt_off00008fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC0 3280 bytes
SHA-256: 486d5c20d52fc4ff099aa9c854ca691e81a3dae08693eae9ab74ea61ab7b7efd
font_03_sfnt_off00009d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D73 10220 bytes
SHA-256: 775221b8097eee5c7cf31f57136ab7af02451a4e8db4f19375ea07028bcb5fe6
font_04_sfnt_off0000c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86