Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fe5fc9819ae953…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 11:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5d09d3cf1b9c63e456e4e25707c4e97 SHA-1: eece5832302dd02fd27825e822c6148834f023be SHA-256: b1fe5fc9819ae9534f4a79ec271ef8fe1c9f57dd7f8648ea5cefd675738a48da
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure for "driver support" to mask malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=driver+support+with+active+optimization+malware
    • https://static.usrfiles.com/ugd/8acad3_62d13f5d3c074e1f9c3b5d64fa80554d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5d5f1db93b345bcac292f10af032b67.pdf
    • https://static.usrfiles.com/ugd/cc14e4_89599bd1fe38493389ce10a0021fe294.pdf
    • https://static.usrfiles.com/ugd/b8c837_809096bc45d647aabe6144a7a1001dca.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/86060847569.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/american_english_file_level_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/glutton_berserker_light_novel.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccafb132baab45bf90fd7492dacbc5e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_bebec2d79e4a49c6bd4768229736433d.pdf
    • https://static.usrfiles.com/ugd/8b9728_ac4446d3d60e4e0fb05dfc326b8cde5d.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/arjun_patiala_full_movie_worldfree4u.pdf
    • https://cdn.shopify.com/s/files/1/0431/7908/1894/files/zinusopejepexugikosova.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/eragon_book_4_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5267/files/2001_chrysler_lhs_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1472/files/model_based_clustering_methods_in_data_mining.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074df.bin
707423f419310791bdff6e77446047eaef896e96673766dc41eaa73b0726cbc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DF 5372 bytes
font_01_sfnt_off0000872a.bin
c411290016f0e634c9f8e762169b304b5f9e17582a4d214c53670138b17ef515
pdf-font-stream PDF embedded font (sfnt) at offset 0x872A 10420 bytes