Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3927a920249e65…

MALICIOUS

PDF

46.5 KB Created: 2020-07-28 16:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0b471a44479b23eb1a86be699e5771b SHA-1: 41404e4928038b65a56e6789c211e7b8e0cac598 SHA-256: ec3927a920249e65115d5f776b3e95bc0b7241816b88d81b3f4ff78936f3e278
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=thumbnail+maker+banner+maker+mod+apk', likely leads to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, some of which are hosted on potentially suspicious domains. 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=thumbnail+maker+banner+maker+mod+apk
    • http://files.americanresistancesevilla.com/uploads/1/3/2/6/132681769/1627700.pdf
    • http://files.downtowndairyqueen.com/uploads/1/3/1/1/131163890/c173b370ba.pdf
    • http://files.burrowsmemorial.org/uploads/1/3/1/0/131070508/zimazolawuv.pdf
    • http://files.bookofnots.com/uploads/1/3/1/0/131070762/4598860.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/vuzijigewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/fujoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/27327950599.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/xirebewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/43729106620.pdf
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/6425250791.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/pababadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/povobemojon.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/dibulagogixosibilebeba.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/
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/vuzijigewi.pd

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006235.bin
f8bbc7a625d47c705d240bc9d77cebcd582ba94835e7bdff64a6d831f8d244ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 4976 bytes
font_01_sfnt_off000072d5.bin
7fd0491a60fdf537be65c4618334e7173f937cf65b706546e2cad0f91b442872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D5 11212 bytes
font_02_sfnt_off00009775.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9775 16060 bytes

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