Malicious PDF — malware analysis report

Static analysis result for SHA-256 e518171f41f31c7b…

MALICIOUS

PDF

51.3 KB Created: 2020-08-25 06:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec18fdf268f8fb8bbca846a69baa9ab SHA-1: 5890e451594918fc0e66a7ddef7e8d1a14903bec SHA-256: e518171f41f31c7bc053346ce573eea2d2c6b52947d98b60df9eaad61a063e6d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains multiple heuristics indicating malicious intent. Specifically, it features a link farm with 16 external PDF links, one of which, https://ttraff.com/pify?keyword=cataclysm+dda+guide+2019, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous links to PDFs hosted on Shopify, some with numeric or book-related slugs, indicates a potential SEO poisoning or link farm tactic to distribute malicious content.

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=cataclysm+dda+guide+2019
    • http://mawezixo.ritaknightart.org/uploads/1/3/2/6/132681513/9b24b.pdf
    • http://mesojeri.zachroush.com/uploads/1/3/0/7/130776728/ebf8fdb01aa5b4.pdf
    • http://bowozomek.thepinkearpixie.com/uploads/1/3/1/6/131606624/8301354.pdf
    • http://rabom.bsl-sc.co.uk/uploads/1/3/2/7/132741508/xutalebegogakepona.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9750/files/agile_scrum_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/75088272252.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/wulaxufupalizalikipedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/bobexumesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/busezovorafetafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/o_namorado_de_aluguel.pdf
    • https://cdn.shopify.com/s/files/1/0436/2783/9641/files/50059586790.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/3037454426.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/dodutuxutugekisujulemulo.pdf
    • https://cdn.shopify.com/s/files/1/0463/0134/8002/files/gesagewevixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3805/6354/files/riwivosidugule.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/29788008753.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008959.bin
677cc73b23f15d7f522ce88ebde90a060c47f4d27804788c3da310894d4968a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8959 5652 bytes
font_01_sfnt_off00009c90.bin
7d506d786d185d6e57d8ec4013e633235048d1d4478cd08cf0d1dd8c4067bb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C90 10400 bytes

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