Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c336b147d985612…

MALICIOUS

PDF

64.2 KB Created: 2020-08-04 03:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb20d7ae09f027dae33d5fcb14b0e0b SHA-1: 75e75a1c1cf365d0460eea7e256867ddef9a534c SHA-256: 6c336b147d9856124f461ee673b01a6a564de4004da8eca216a876743005570c
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 link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=acls%20course%20book%20pdf. While no scripts were extracted, the structure and numerous external links strongly suggest a malicious intent to redirect users to potentially harmful sites.

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/wb?keyword=acls%20course%20book%20pdf
    • http://files.thetruthstandsforever.com/uploads/1/3/0/8/130815437/vubapatemumojuva.pdf
    • http://files.bakeabetterpie.com/uploads/1/3/2/7/132712011/6288096.pdf
    • http://files.luckyfoxkennel.com/uploads/1/3/0/9/130969478/nojenosekes-foxobojibab-gilazurejova.pdf
    • http://files.rekwiredcosmeticsllc.com/uploads/1/3/2/8/132815882/2856810.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2684/9697/files/vaxel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/7539732370.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/61915376345.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/cookie_clicker_one_mind.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/23197614029.pdf
    • https://cdn.shopify.com/s/files/1/0438/9175/3115/files/adjoint_and_inverse_of_a_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6835/0873/files/vilaxebow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sagomowaroperovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/rutojenotoloxat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/31035847825.pdf
    • https://cdn.shopify.com/s/files/1/0431/8874/8452/files/40530187286.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_off0000bda9.bin
2e696cce7cf6c4abdbf3f303cfbaddfab42b3e9d154bab94046fb9030f47f17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 5132 bytes
font_01_sfnt_off0000cf33.bin
d6d11d089f37a502eaeac538464ad9384d6c57e1365f773598cb5e7e7346ebc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 10816 bytes

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