Malicious PDF — malware analysis report

Static analysis result for SHA-256 117381462c5ca7e5…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 20:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b64fa796c415555df8f55deb1ed9845e SHA-1: 3597153d2079fb0c73818ef7ee8518e4e7e00f40 SHA-256: 117381462c5ca7e5e62f29303ee45b5b11dc0d455578a161d1816a5fde2bb044
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to a link farm designed to distribute SEO spam. One prominent link, https://ttraff.ru/wix?keyword=taco+bell+churros+nutritional+information, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious activity under the guise of nutritional information. The ML classifier strongly indicates 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.ru/wix?keyword=taco+bell+churros+nutritional+information
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1374/1471/files/mesixodojakokobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8836/files/dr._gundry_s_diet_evolution.pdf
    • https://cdn.shopify.com/s/files/1/0428/9927/5935/files/81631287349.pdf
    • https://static.usrfiles.com/ugd/b8c837_965c8c0373814048ad8d9eb9b11ac205.pdf
    • https://static.usrfiles.com/ugd/913720_734ef2a596d04558abee147959dd1bb1.pdf
    • https://static.usrfiles.com/ugd/d1d005_6d87409537c448ec8b7704b4bd3583bb.pdf
    • https://static.usrfiles.com/ugd/affb4a_8c0fd7899fb147a2b681c1a5936c3188.pdf
    • https://static.usrfiles.com/ugd/b65acf_b0df0588fc7c4d6882c5d978afc56f83.pdf
    • https://static.usrfiles.com/ugd/aef5b7_7144cf100e19492eb120ebaea8682db7.pdf
    • https://static.usrfiles.com/ugd/10e3af_2c9b18a71862459d99ed511b6fb0ef03.pdf
    • https://static.usrfiles.com/ugd/ed64d2_e189330c55f44c44b7339873f765a0c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3503e436e03d486db9ff2ef8d9ebfd65.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0bad03dd9e14df385d2d34b03e16fb8.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_8c99734b48774aedbe48127a602c742c.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044d8.bin
b328da738cc5204f423ecd6ae3c72fb134533874eac43d0c8e4357283919a35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44D8 5092 bytes
font_01_sfnt_off000055e7.bin
7e8f4e43c80f2c698d88a67a420558d94dda59c362cd5373b36263affb2258bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E7 7184 bytes
font_02_sfnt_off00006964.bin
e303072c589eadfc70f3f71eb71ecbde3e504a7682a11ff319f6a3a670e5bfe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6964 10024 bytes
font_03_sfnt_off00008b99.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 4324 bytes

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