Malicious PDF — malware analysis report

Static analysis result for SHA-256 1718de9db6d5a2a3…

MALICIOUS

PDF

38.3 KB Created: 2020-08-13 01:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a7956f5ac9429567e0292983444773d SHA-1: 967a8d0ffabd19b1ea712f8b5662a9ef1aef4d08 SHA-256: 1718de9db6d5a2a3dfb6490c4c3ad572225143fdf247aa0826e7f9ad5f5f2f74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the text '6th grade grammar quiz pdf' and the malicious URL, suggesting a lure to trick users into clicking. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=6th%20grade%20grammar%20quiz%20pdf
    • http://files.womansclubofpowhatan.org/uploads/1/3/1/6/131637652/wozovususonolof_sununemep_kojufikunolaw.pdf
    • http://files.englishwithtuttle.com/uploads/1/3/2/7/132740458/7448167.pdf
    • http://fivixe.monsieurcoulibaly.com/uploads/1/3/1/4/131453323/rovodilolilo_jipibefusuja_dogolesorinukow_gagisatozeb.pdf
    • http://files.jimmyjazmes.com/uploads/1/3/1/4/131437418/jajuk_tudepi_zivijidesuz_gezipo.pdf
    • http://files.alphaprep.org/uploads/1/3/0/7/130776728/pubuvuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/20416175561.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/area_and_perimeter_formulas_for_all_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/86625744171.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5711/files/74413984626.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/37247792337.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3527/files/64151847272.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1235/files/tafenizalorubonopebed.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/latewipokuvilezivu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6116/4697/files/bupijomutu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5982/0182/files/bosch_glm_30_professional_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/vacunas_polisacridos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad8.bin
7f6f1934ee9a4d8e959aeb10ce1031cfe7da9d08b96aa01d4e8b1705e07baa34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD8 5144 bytes
font_01_sfnt_off00005c55.bin
0c4fbcbd06454d2b4fd92adb3e7f7a16f6b25cdb93ee48008d65f9c0cdba02f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C55 9972 bytes
font_02_sfnt_off00007e25.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E25 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.