Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff82accc09c82c7…

MALICIOUS

PDF

72.0 KB Created: 2020-08-06 15:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7206fe17035f021d39619dad0a8576b8 SHA-1: 655cda076d081580fd40e8d1eb756ee1bad40126 SHA-256: 0ff82accc09c82c7438bb2ec815f600aa41889baa1867d222e64918187d1e682
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of 30 external PDF links, many hosted on Shopify, and a critical redirector link to 'ttraff.cc'. This suggests a tactic to distribute malicious content or SEO spam. The document body, though heavily obfuscated, contains the text 'English vocabulary with meaning pdf download' and the redirector URL, indicating a lure to download files. No scripts were extracted, but the presence of numerous links and the redirector points to a malicious distribution scheme.

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=english+vocabulary+with+meaning+pdf+download
    • http://files.nayaung.net/uploads/1/3/0/7/130739833/2e89edb1ee7c.pdf
    • http://files.firststepcleburne.com/uploads/1/3/2/3/132303286/3077189.pdf
    • http://files.andrewbroomphotography.com/uploads/1/3/0/7/130775310/9be3c5b88fd891.pdf
    • http://files.ilonayoga.com/uploads/1/3/1/4/131453733/dd2461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/payroll_accounting_bieg_toland.pdf
    • https://cdn.shopify.com/s/files/1/0430/3038/0698/files/belarigiwojigekesopuxatog.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/pinebuvir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/56195045941.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/91095887442.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/caucasian_chalk_circle_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/89962069529.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/mokesodatebibisexit.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/wakijizafama.pdf
    • https://cdn.shopify.com/s/files/1/0431/0676/2905/files/nubonekuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41758367329.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/viva_la_vida_guitar_chord.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/foxudujun.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/38730411003.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
    • 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_off00006e64.bin
dc03ea806b561d760980d148884187c207a866734a0a2e98b5128a4aa5cb4a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E64 15536 bytes
font_01_sfnt_off0000a101.bin
b75de267abaf4c3de27b29884a86ecb1f3d638cf30cb5ff5d10d7b3b0cf5ea95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA101 5920 bytes
font_02_sfnt_off0000b515.bin
83d921442a7e3399ee9a0e45ed4994ea634200b925299127b386700b7486a5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 9080 bytes
font_03_sfnt_off0000ceb3.bin
d10cc0bc014a3d3e017debda50bc3e8b2d9155c816833ae9f7690eb8a7dd6bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 10440 bytes
font_04_sfnt_off0000f1ef.bin
593eefa8d67bf31b52097e47ef494625954e7c8ad78a7feed1851ea6a9045107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 19264 bytes

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