Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4b0186b2a5a7dc…

MALICIOUS

PDF

44.6 KB Created: 2020-08-04 22:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33dc97c2aa4e70809b746ca35b16b1ce SHA-1: fe4f619f8dba63ccc1b04aca644ac7c0967dc439 SHA-256: 8e4b0186b2a5a7dc2b0b91c2e4ffe879121fcb99b77ac781176875c2542ba74f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm, suggesting a social engineering tactic to trick users into downloading malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=aptitude+shortcut+tricks+book+pdf
    • http://files.beanashtangi.com/uploads/1/3/0/8/130874338/vidizuguv.pdf
    • http://files.awhillans.com/uploads/1/3/0/8/130873781/fa6d13970d3.pdf
    • http://files.absintheaccessories.org/uploads/1/3/0/7/130739826/3b851e6543.pdf
    • https://cdn.shopify.com/s/files/1/0438/4600/8982/files/reinstall_npm_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/7328/8869/files/palatogagopoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasexenumufuxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/organic_chemistry_bruice.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/82392254193.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/9687708992.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/sogotenoguvufidaxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/91244390920.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/70485225449.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/61183566.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/list_of_adjectives_and_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/nisutizuv.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058af.bin
4eaa3b392da24f08733cc71c4680fa3bf114e223ed32738a3203a4debb8bcdd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AF 5192 bytes
font_01_sfnt_off00006a4a.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4A 2116 bytes
font_02_sfnt_off00007415.bin
346d7a6b13f57ac65761a453f4bd29ab4dd53a975be1df2a8022ff98f4753878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7415 15400 bytes

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