Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5b1db23201d46a…

MALICIOUS

PDF

47.3 KB Created: 2020-08-13 15:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f42ce80c773cb5add6a2bfe8bc20f8 SHA-1: bda5872df68730dd6eae2d995136ca4936e030b0 SHA-256: cc5b1db23201d46acb9db5f13492cc3ad330e8f318306d62c674a70c3de408c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=aristoteles+metafisica+libro+1+pdf' which is a critical indicator of malicious redirection. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate PDF documents.

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=aristoteles+metafisica+libro+1+pdf
    • http://files.msfirephotography.com/uploads/1/3/0/8/130874676/7662538.pdf
    • http://files.vapagirlsbuildla.com/uploads/1/3/0/7/130776485/tetenudufilunoz.pdf
    • http://files.florablackettdesigns.com/uploads/1/3/1/4/131483343/2950589.pdf
    • http://files.delinadream.com/uploads/1/3/1/6/131606046/sizisugosuda.pdf
    • http://towowu.1040law.com/uploads/1/3/0/7/130740387/dozuwaliziverif.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/bobojesuxiwojibasur.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/vetanudidivemugidawogom.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/nezotavirananopini.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/direito_penal_parte_especial_bittencourt.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/postgres_show_databases.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/58136708958.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/open_veins_of_latin_america_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/35459041640.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/57246994925.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/26902647380.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/china_s_war_with_vietnam_1979_issues_decisions_and_implications.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/75839092925.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ddc.bin
b15db6ca9023e09a66fcd6800b6083fc634c0c15f0e9bd5196681ecd773bf566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDC 5480 bytes
font_01_sfnt_off00008065.bin
1bbc583d9386d5e9c7ca76c68cddafaec1510338bf5c3aa428df146160966370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8065 15456 bytes

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