Malicious PDF — malware analysis report

Static analysis result for SHA-256 626733f59ebe425d…

MALICIOUS

PDF

52.8 KB Created: 2020-08-18 20:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbbdb74333ec879254ada31a76b8c760 SHA-1: 4dce4e921434c3d07cc12279e47f38062c8121f8 SHA-256: 626733f59ebe425d64da316e1004f5e6fe3ef431f17fedd9a33e179d40a21a3f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick the user into clicking it. The ML classifier also strongly indicated maliciousness.

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=5e+barbarian+zealot+guide
    • http://gogenixat.onyxfgallery.com/uploads/1/3/0/8/130874488/tixisejen_kuvesamoxetar_kapok.pdf
    • http://files.thecapacitygroup.org/uploads/1/3/1/8/131856547/batotaxu.pdf
    • http://files.trendclothinginc.com/uploads/1/3/1/4/131437523/xarusi.pdf
    • http://files.kcboutique.shop/uploads/1/3/1/3/131379543/pupimulibex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/mowezipamila.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/59542013657.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/jinaxijunokubum.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/jodasaxumejuzusofuvori.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/batoxoxunavuxogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/45197966467.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/black_desert_mobile_sea.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/roblox_perlin_noise.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/gotorovabomuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/bible_names_and_their_meanings_for_baby.pdf
    • https://cdn.shopify.com/s/files/1/0437/8840/2839/files/64703605128.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/jejujida.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/convite_a_loucura_brennan_manning.pdf
    • https://cdn.shopify.com/s/files/1/0432/1715/8312/files/loxamotax.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_off00009217.bin
c380496b87c870ff03092c8f1de51ae3c986d63a5bca2be1b2267421e9027748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9217 5032 bytes
font_01_sfnt_off0000a348.bin
009073eb9dbc0e0be7d32fc20ce615c7ad7b4a496487b9fadc0b1eb156348072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA348 10120 bytes

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