Malicious PDF — malware analysis report

Static analysis result for SHA-256 665d21391ad0a781…

MALICIOUS

PDF

42.8 KB Created: 2020-08-12 08:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89eb54e2270f05c524a7d07992a4dde SHA-1: 4106330b7ea9b7ea96012641c2e9062b276eb9e1 SHA-256: 665d21391ad0a78195cf2d25161528d571f854fe0f77efb8ac6eff37d9f0043a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to solving a Rubik's cube, but its primary function is to host a large number of SEO-optimized links, many of which point to other PDF files. One of these links, https://ttraff.com/wb?keyword=how%20to%20solve%20a%204x4%20rubik's%20cube%20pdf%20download, is identified as a malicious redirector. This indicates a tactic to drive traffic to potentially harmful sites or to distribute further malware. The ML classifier strongly supports the malicious nature of this document.

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/wb?keyword=how%20to%20solve%20a%204x4%20rubik
    • http://files.assisted-living-resources.com/uploads/1/3/0/7/130739379/bazep-luxus-wimaziniraf.pdf
    • http://files.yinstillyoga.com/uploads/1/3/0/8/130873995/2957153.pdf
    • http://files.randallbmusic.com/uploads/1/3/0/9/130969300/4578256.pdf
    • http://jesudowek.unitedchurchofhuntington.com/uploads/1/3/0/7/130775162/6722044c36.pdf
    • http://zavedazet.shannancalcutt.com/uploads/1/3/1/6/131606490/bd002678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/the_science_book_big_ideas_simply_explained_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/tefunusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/clicker_heroes_save_game_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/53987639010.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/42329996976.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/propiedades_de_la_moringa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/dijulibinilasiworonibe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/rupivivumezuno.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1364/files/anivia_mid_build.pdf
    • https://cdn.shopify.com/s/files/1/0434/4522/3591/files/60907514956.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/baofeng_bf_f8hp_manual.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_off00006811.bin
78e17d781bd69c4ce897141ef4e5c8221a3f192f990e7d5583d3974e6c5a6166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5656 bytes
font_01_sfnt_off00007b82.bin
77336fa417f2e4b5ed02b114e546e099581dcb973b135ff592caeac0f6fcb7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B82 10152 bytes

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