Malicious PDF — malware analysis report

Static analysis result for SHA-256 87619a872f2400b4…

MALICIOUS

PDF

44.0 KB Created: 2020-09-02 00:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a43d4b0dc642362150f90e89c352b3 SHA-1: 13c0731f21bff4de90458c7e554b161d6807d161 SHA-256: 87619a872f2400b4f29485ac146cbfa431ab7b1469064238d94c93c606fc045a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'interview top ten questions and answers' and the malicious URL. This suggests a phishing or scam attempt where the user is tricked into clicking the link under the guise of useful information, leading to a malicious redirector.

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=interview+top+ten+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0466/8964/8804/files/tracing_lines_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/65857528340.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/conjuntivitis_bacteriana_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/anoreksia_pada_anak.pdf
    • https://static.usrfiles.com/ugd/b8c837_d07f860102284cf0ad1cedca31d2a821.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/common_monomial_factor_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/5113314067.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/los_numeros_primos_y_compuestos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9150/9919/files/thirty_six_views_of_mount_fuji.pdf
    • https://cdn.shopify.com/s/files/1/0443/4070/7484/files/regulacion_epigenetica.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/spring_boot_remote_debug.pdf
    • https://cdn.shopify.com/s/files/1/0465/0467/3430/files/formgroup_reset_formarray.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_off00006e8c.bin
790655c0558e428735a852c15bbe8a28ab271d8c8124093e99693e3efbd5c50a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8C 5136 bytes
font_01_sfnt_off00008025.bin
28481d15e919b6bbde20ed29a6b0b62d10f7928f16b01eb64771f80ad9e009b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8025 10376 bytes