Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ae6786a5a6577…

MALICIOUS

PDF

41.6 KB Created: 2020-08-28 01:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8af00404e2869da84899a5f464ffe4a5 SHA-1: 8582e2a36b53946d18b053a2abd9513c86fe0e00 SHA-256: 5d8ae6786a5a657724d707b810121fa0138e04dd8ff90f311d62e5f85df30fef
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service and then to other PDF files hosted on various domains. The primary redirector URL is https://ttraff.cc/pify?keyword=animales+que+comen+plantas+y+carne, which is flagged as malicious. This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. No scripts were extracted, but the heuristic firings strongly indicate malicious redirection.

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.cc/pify?keyword=animales+que+comen+plantas+y+carne
    • http://pixida.omthree60.com/uploads/1/3/1/3/131398455/pagew.pdf
    • http://ditan.coilpod.com/uploads/1/3/1/8/131856584/besize.pdf
    • http://files.steedgroup.org/uploads/1/3/1/4/131453486/xiwurepepi-dezef-kodufurasisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/4025581907.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/kemedo.pdf
    • https://cdn.shopify.com/s/files/1/0446/9896/0026/files/objective_c_delegate.pdf
    • https://cdn.shopify.com/s/files/1/0437/5268/5720/files/chronological_order_forms.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/mixekap.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/90592786226.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/laxojebovijoxabivebiga.pdf
    • https://cdn.shopify.com/s/files/1/0463/5767/6193/files/14996964436.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/98563561729.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/84316637077.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/47693820115.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/short_story_english_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/airasia_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6593/files/tuked.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_off000061fc.bin
5f15846b4dd2aa1dd390176da725372bb11a248dbd94589ed77056db62b24c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FC 5296 bytes
font_01_sfnt_off000073e6.bin
5eea7293c27191bfe6106559d91c233d5b354ac92c6f918d5632d1211bc87eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E6 11008 bytes

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