Malicious PDF — malware analysis report

Static analysis result for SHA-256 70daa3a5d147cbcf…

MALICIOUS

PDF

39.9 KB Created: 2020-08-24 10:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41295579d90075ae5ff5ca8d086038a8 SHA-1: 8f27a37725f2e07dffd958425c7d4941bc626951 SHA-256: 70daa3a5d147cbcf2fdfd9948955c326f6130b7a1d9158e17e8bb1a3d5b7b81e
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a redirector to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the malicious URL, suggesting an attempt to lure users to malicious content or for SEO manipulation.

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=breather+meaning+transformer
    • http://files.dantothmusic.com/uploads/1/3/0/7/130775223/c6a326.pdf
    • http://dazer.seislagos.org/uploads/1/3/0/7/130775136/9504171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/258713913.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5239/files/final_cut_pro_intro_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/basic_digital_electronics_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4838/files/92788930365.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/16953589509.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9489/files/49028211119.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/5450859265.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/ielts_writing_task_1_example_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/46177713746.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d48.bin
b9829dd65f341ef804820e598b650050d662b831e9a37bd00bcd1670d227fe2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D48 5196 bytes
font_01_sfnt_off00006ed0.bin
13a511f929ceddab3166e5852d4ca7f66e7764cd7b7d61007baa43456dd6c665
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 10740 bytes