Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cbfd204ffd65df…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 21:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c712cfaa72b04659048702e4a753473b SHA-1: 77f9f09a2237fada13758dbdf4c7a799c2e12abd SHA-256: 75cbfd204ffd65df5d73f79eb0ea0f732405c7c2fd295303d5204b3621ae28d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the primary purpose is to direct users to malicious content through a chain of redirects, likely for phishing or malware distribution.

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.ru/pify?keyword=anjali+cbi+tamil+songs+free
    • http://files.vladimirblagoev.com/uploads/1/3/1/8/131856195/2574461.pdf
    • http://weboraf.igmlegal.com/uploads/1/3/0/7/130739892/zavowavirow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/65506052539.pdf
    • https://cdn.shopify.com/s/files/1/0438/2556/1757/files/knowledge_encyclopedia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/sasixaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/insuficiencia_cardiaca_congestiva_tratamiento_nutricional.pdf
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/free_html_template_for_ecommerce_website.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/bilofavabilukozajogibol.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/phone_background_size.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/31441496833.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/64343581294.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/78585365417.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8453/files/grammar_test_tenses.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/amide_nomenclature.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_off00006091.bin
a6be22d69dfbc3b5144301eed642475f661420f43926c4f891a368de7abb4374
pdf-font-stream PDF embedded font (sfnt) at offset 0x6091 5408 bytes
font_01_sfnt_off000072d7.bin
5e6a894a0c9ccba7ae1f4973a04557db50bb28743274aa12fa49fcca46a7982a
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D7 14192 bytes