Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e12186acebd9767…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 07:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9545771129f05eafd753e30b8f23ee2 SHA-1: 764977ca055adec7ae74ef52fb50b0a7f4f3db1a SHA-256: 5e12186acebd9767058563254103ec666574fcef67337b15ff0f6961f508ab48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding, suggesting an attempt to lead users to harmful content or malware downloads.

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/pify?keyword=glassless+mirror+sheets
    • http://files.bellabugphotos.com/uploads/1/3/2/7/132710756/ruwiju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/xss_game_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/1918370218.pdf
    • https://cdn.shopify.com/s/files/1/0428/6460/7398/files/psychology_personality_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3535/files/lopamidogo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/warhammer_wood_elves.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9600/files/wunupediwolulakumofiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/nfl_scores_espn_live.pdf
    • https://cdn.shopify.com/s/files/1/0465/4858/2550/files/germany_flag_colouring_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/causas_de_alodinia.pdf
    • https://cdn.shopify.com/s/files/1/0441/1952/3480/files/format_of_experience_certificate_for_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/jorge_baradit_libros.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_off00006441.bin
a2a123a1742867043eefdb0db94c0b5df69e9ce9ab7f7ad357af0d92fb7e3db1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 4956 bytes
font_01_sfnt_off000074fa.bin
55f216fe62a98a0f1033386f0f6c27fa9f7125a7a003d2a689400a014411751e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 10524 bytes