Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d27379038f7c33…

MALICIOUS

PDF

35.8 KB Created: 2020-08-13 04:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49b552a714ec7cbb038a4fb28b4c272 SHA-1: 7c65f64a85a1de15d56c91d5d1f1bbe2907881dd SHA-256: 18d27379038f7c338255c9d594cd66adb1f050d4c2a5280c1fd8a49db53aba5d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=instrumentation+control+data+acquisition+and+processing+with+matlab+pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • http://files.libertyfreewill.org/uploads/1/3/2/6/132695301/6182942.pdf
    • http://files.exxposeyourbeauty.com/uploads/1/3/0/7/130739158/1c4de602ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/rusilesudaguxudekolego.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/wepewa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/91519498180.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/complex_carbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/23118399036.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/48571847044.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/50181435840.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1257/files/77407801158.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/povugonenenivovolisen.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8991/files/18675671349.pdf
    • https://cdn.shopify.com/s/files/1/0451/4473/5909/files/zusetozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/tomb_of_annihilation_companion_download.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_off00004b49.bin
edca849748fedc9c2fdc05ba9525761e7d27664398ee324a5b1c6813a10d9724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B49 5864 bytes
font_01_sfnt_off00005f0c.bin
769dbfcd6df47e205c44df1b4601f3aa2437c34863a74031828308951eb4e4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0C 10100 bytes

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