Malicious PDF — malware analysis report

Static analysis result for SHA-256 1981e25e5e76144b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-02 21:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6da0c6fb5202a7c80a60fb93e73de86e SHA-1: 73af7fd80a07d69cf16a9b05b98db193850c5021 SHA-256: 1981e25e5e76144bb57102c05a370bf3ccaacbeab7c7f4d6c9e1d45f0500537f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.cc/pify?keyword=java+initialize+2d+array' is a known malicious redirector, likely used to obscure the final destination or distribute further malware. The document body contains garbled text but also includes the same malicious URL and several benign-looking Shopify URLs, indicating a potential attempt to disguise the malicious intent.

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=java+initialize+2d+array
    • http://files.sixeightapparel.com/uploads/1/3/2/8/132814086/7206435.pdf
    • http://files.midwesternsales.com/uploads/1/3/2/6/132681690/7467663.pdf
    • http://files.artbookart.com/uploads/1/3/1/4/131406841/c5ede9c8a9ca.pdf
    • http://files.nigella--sativa.com/uploads/1/3/2/6/132681359/vejudavakaguxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fupibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/robert_half_timesheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/xinizasa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/nilosinafekajatasi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/92608946989.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/panasobakigujemufagegiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/45906771278.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/nobagigoxusuwiviro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2574/files/83572481363.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/38894072213.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/monisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/likugepavile.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/warusolenew.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_off000075fb.bin
321cb7d9cf37d4ebe5d5bd1995b05a4c272d43eeec7ab24e1c6894b8599fb551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 4976 bytes
font_01_sfnt_off00008714.bin
28be401f087e7b1e2474f4cb4b1fff15c10abef46a972967901e66d9ad4f75e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8714 10804 bytes

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