Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a3f0c9a8ef222b…

MALICIOUS

PDF

88.2 KB Created: 2020-08-30 11:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153af03f19d7b2c199213d7062f3cb18 SHA-1: 1efbbe0f69e72c7952a1e74d0a1f2b5f82bce3d5 SHA-256: 72a3f0c9a8ef222bf2fdf37b9e74de94b596492775bef502b7c77864ff618034
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. It also exhibits a PDF link farm heuristic, embedding numerous external PDF links, with the primary one being a Shopify URL. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=yuragi+sou+no+yuuna+san+seiyuu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8506/1541/files/naluwujiduke.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/g_c3_bcnstige_fl_c3_bcge.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/97108455353.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/vajipoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/brilliant_pala_screening_test_sample_papers_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/capacitor_bank_calculation.pdf
    • https://static.usrfiles.com/ugd/b8c837_821b45cd8966440ba66dbcaf78623e81.pdf
    • https://static.usrfiles.com/ugd/cc14e4_d2d232e9197e4b4e9ed21d0adae73e7a.pdf
    • https://static.usrfiles.com/ugd/80c1db_ac9ea56d4bd34b67b9bdb060398be40f.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b21ff665ae4c409e69a998991bc73a.pdf
    • https://static.usrfiles.com/ugd/e3c460_8bf6b212580b497ca1d64ced52a3b626.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a6ac33b1af34a1f9dab9e5e29e42d36.pdf
    • https://static.usrfiles.com/ugd/b8c837_1681138beec549f89663bdb1f729f914.pdf
    • https://static.usrfiles.com/ugd/b8c837_946e224b9e224da3ba33e5d7e7495b8f.pdf
    • https://static.usrfiles.com/ugd/10e3af_d4d75612454740679b2dbe683bd21e46.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b36.bin
3ad7fa0c9cabcc3ccfa0c9715b83c60f74df9d6857fbaeddaa656a20964d713c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B36 32468 bytes
font_01_sfnt_off0000f0af.bin
abcec365646e413d7512e4bd6be08dec3ec9bf15a0d06576f746125590baa757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 4684 bytes
font_02_sfnt_off000100a3.bin
05c77b09da7211b726496f1803f716798f4bd23551818bb237d5d97c71c407fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 14316 bytes
font_03_sfnt_off00012de3.bin
7ed423fd6f64a2accaab24a388a557cab9318e50e2ef4475c53ca1e35efe0f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 16632 bytes
font_04_sfnt_off000144f4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F4 4324 bytes

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