Malicious PDF — malware analysis report

Static analysis result for SHA-256 863fc81c57f7681c…

MALICIOUS

PDF

51.2 KB Created: 2020-08-09 15:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9791d1125cca891fb4c99f261721112c SHA-1: 6a9493485c37db7e7f6daa65ea1fec6f8bd3ec8b SHA-256: 863fc81c57f7681ca02259ade4fa62512c856d62eb91387eb1a0b56af583b056
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=rational+fasting+challenge+pdf'. The document body, though heavily obfuscated, also contains references to this URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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=rational+fasting+challenge+pdf
    • http://files.communityfarmersmarketbg.com/uploads/1/3/1/0/131070872/setiwezukusuz-puderojogibado.pdf
    • http://wenix.globalnomaddy.com/uploads/1/3/2/3/132302782/voxiz.pdf
    • http://files.brunswickbands.org/uploads/1/3/0/8/130814980/527727.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/bilegazabalanuseruro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/attachment_style_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/5797800531.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3495/files/72934680084.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/1121068974.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/92666351703.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/business_law_notes_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/blancanieves_y_los_7_enanitos_cuento.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/bulaponigijokimusaxudodiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/piridizul.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/sirogipaxedetoxazibuwokew.pdf
    • https://cdn.shopify.com/s/files/1/0440/5090/7286/files/zozejipuwinaregadiram.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/21727530559.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_off00008a44.bin
bde40dd144b85c5fbf67fd044dcc837548d0b3c1fe9865277db6af5f26454f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A44 5328 bytes
font_01_sfnt_off00009c74.bin
16bb9b22f5fd84da6575e36e173f8582540799e919c200bb5461c279b6e1c5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C74 10236 bytes

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