Malicious PDF — malware analysis report

Static analysis result for SHA-256 14545b1384ca6f8d…

MALICIOUS

PDF

52.9 KB Created: 2020-08-31 05:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa7b336b5a787e09609db16d7c46f70 SHA-1: 8e7ecc4adf3e907f0e6e35b8ecaa3d3044dba825 SHA-256: 14545b1384ca6f8dcfeba5dff960f0cbb2f76bf0ee03a6ead60e33fa017c9ae9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.me/wix?keyword=brain+gym+exercices+pdf'. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to a malicious site. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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.me/wix?keyword=brain+gym+exercices+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/68660016976.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/gemstone_identification_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/36583055085.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/nudirufakexikuketan.pdf
    • https://static.usrfiles.com/ugd/37428b_40e9432a3869481ca713aebd46b1b170.pdf
    • https://static.usrfiles.com/ugd/1decf9_c38f5df4ca1744198d0214f8c00aa847.pdf
    • https://static.usrfiles.com/ugd/36f25b_bf1bab1f9dc34bb18bc61b52b9058add.pdf
    • https://static.usrfiles.com/ugd/74e905_cd68eeb6ca184404b09112f540f4a3c6.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_93094e15762d47c19092bbd01de40b50.pdf
    • https://static.usrfiles.com/ugd/b8c837_73a997d589bb4aad9a06a1fbfdf871ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b37cb7d5ce14beebf8bb283dede45f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4efc041662804cd8850484ddba4488ab.pdf
    • https://cdn.shopify.com/s/files/1/0457/7515/9462/files/55524883444.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/sirejosatol.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/68948437347.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/refrigeration_and_air_conditioning_handwritten_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/workplace_safety_and_health_act.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_off000090e9.bin
a55070bb9283601b81adfdeafd9af5643b9cc1ae21446d73b91031df9ff43f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E9 5660 bytes
font_01_sfnt_off0000a421.bin
ef930e040afcc5d11d53a2cc107f2826fbd71a64989985064fb2310a173c96a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA421 10016 bytes

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