Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5095edb85d7faf…

MALICIOUS

PDF

45.7 KB Created: 2020-07-19 03:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fba5ba3ed7c65326da9b0218e093b4a SHA-1: b25b3683896b653ae39bbb97fe929a8ffa5778a7 SHA-256: 0f5095edb85d7fafed10ba0840c90a0cbe410a5b6b1625ec5bb2e0a4a8994599
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a link farm designed to redirect users, likely for malicious purposes. The document body, though heavily obfuscated, contains keywords related to a dialysis machine, suggesting a lure to trick users into clicking the malicious links.

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/pify?keyword=fresenius+4008s+dialysis+machine+pdf
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdf
    • http://files.washnword.com/uploads/1/3/0/9/130969546/8253e2e153.pdf
    • http://files.gingersnapsapparel.com/uploads/1/3/1/4/131410234/wobevaruwawirifazus.pdf
    • http://files.maysplumbingworks.com/uploads/1/3/0/7/130776755/5963642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jawajadepoj.files.wordpress.com/2020/06/90789164252.pdf
    • https://netuvujon.files.wordpress.com/2020/07/26186056157.pdf
    • https://lasofibile.files.wordpress.com/2020/07/xufamikolu.pdf
    • https://neguraxopon.files.wordpress.com/2020/06/62873863619.pdf
    • https://jevitexak.files.wordpress.com/2020/07/kopasijaxi.pdf
    • https://jodadisak.files.wordpress.com/2020/06/rivibovidawevivelusono.pdf
    • https://xividitusaje.files.wordpress.com/2020/07/xovetegetuxorilaw.pdf
    • https://zukijimalu795932751.files.wordpress.com/2020/07/bafukerilisuborewifetiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/divas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/vajiwuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/62011519986.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/wukelinujudid.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/91914810278.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/40903655321.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/fipewedagasupena.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/rubop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/10633622393.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_off0000723d.bin
3d91de0ce64710d89b947500e584a4fd36461145a7abb048b1558754021ff1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723D 5568 bytes
font_01_sfnt_off00008508.bin
fcda9cfee3f68115b26cc78030c0ca78503c656566fa2d05e6d7ca63ffa6157b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8508 10588 bytes

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