Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3a4e08d5f59427…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 12:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b87be8568f2dc0ca5f33a34c4d2f51a2 SHA-1: a5139a19443b7c1042aab90e1ebc7c7ddd97f29e SHA-256: 0c3a4e08d5f59427705063a7f58e6ab9b5e6458c3c8928f1d3f8ded40f1ff916
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.com/wix?keyword=car+mechanic+simulator+2018+engine+l', points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or directing users to malicious sites.

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.com/wix?keyword=car+mechanic+simulator+2018+engine+l
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_09ff9eee10534719a34530a46cfcff34.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8382fce916485a95f9226344827507.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0bbb218a3344a518b3ca18c344ff1bf.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_c1840f8298414be9b4904648f2cd9c6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c5064a05d2f46b4ac596c50e7c9ba93.pdf
    • https://static.usrfiles.com/ugd/0789d5_6a927e6dda91493bb99c65b80b7da2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/agriculture_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/83396490789.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7206/files/je_me_debrouille_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/building_materials_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0461/7194/7161/files/bupevasitev.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_off00006968.bin
7b6d40526a7f233ba80460a28a979bf0337e701375e19b32a0950a311c7cca0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6968 5636 bytes
font_01_sfnt_off00007c6d.bin
e020c8aee26a758f3ecb311a159d3f1a9257d2e801d3433d84edd152d66a1d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6D 10308 bytes