Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cec8710d1754571…

MALICIOUS

PDF

40.4 KB Created: 2020-08-21 07:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17937f38deb40c77b1c371c56d7ffda3 SHA-1: 4db7c7ac4319b915327fd8557488a4a59f486e48 SHA-256: 1cec8710d17545716df5a7c6a3a721d6807088b8f5a083f7bdb6ba661ce125dc
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and references 'Plataforma scielo brasil', suggesting a lure. The presence of a large number of external PDF links, many hosted on shopify.com, indicates a link farm strategy, likely to improve search engine ranking or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=plataforma+scielo+brasil
    • http://xumaw.lawlorstudio.com/uploads/1/3/1/3/131398591/tevum_keseduwol_nexarizov.pdf
    • https://cdn.shopify.com/s/files/1/0433/8522/5372/files/american_beauty_cocktail_diffordsguide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/retufodematowixezijujifak.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/31120695326.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/31805998292.pdf
    • https://cdn.shopify.com/s/files/1/0438/0121/5138/files/les_quadrants_de_l_abdomen.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/47839730764.pdf
    • https://cdn.shopify.com/s/files/1/0440/5769/0262/files/78989465141.pdf
    • https://cdn.shopify.com/s/files/1/0437/3102/6071/files/apocrifos_del_antiguo_testamento_tomo_iv.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_off00006088.bin
8aea8bc4886cc54504f8a71b8f3ab479b3cb8c8348553cd0df02b228ee1d4d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6088 5168 bytes
font_01_sfnt_off00007202.bin
92d2e63a3011be56fcccbc48944abbe73be2755d46af4966ea8a9086a7e55c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7202 10496 bytes

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