Malicious PDF — malware analysis report

Static analysis result for SHA-256 102e5cfd1bd551f8…

MALICIOUS

PDF

41.8 KB Created: 2020-08-29 14:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356f29c6e1ba43ee3c7fd453bedf917f SHA-1: e956b07ab017a650be0f42b711f7ddc9e5be7c3e SHA-256: 102e5cfd1bd551f8e2baae82236c860a8e65ae62a25d548ec4f22dff0e31eb2c
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs, with one primary link identified as a malicious redirector. This suggests an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure itself contained multiple external links.

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=lee+load+all+12+gauge+charge+table
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/google_sheet_script_set_cell_value.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/fagovewokelexanunamadin.pdf
    • https://cdn.shopify.com/s/files/1/0436/3960/3360/files/82781811384.pdf
    • https://static.usrfiles.com/ugd/b8c837_d78006bb28264b5698053f9d80368bbf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/gozopikexodas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/kixufijujitig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/94237684606.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/change_background_graphics_powerpoint_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/0252/5856/files/adaptive_control_astrom_wittenmark.pdf
    • https://cdn.shopify.com/s/files/1/0434/7609/1045/files/english_to_afrikaans_translation_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/13195568748.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/68194934395.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_off00006517.bin
9239da22e3ac97d5690cd0895f5fe0c7ef3447ff0e9f14e16b94bde7308a5987
pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 5288 bytes
font_01_sfnt_off00007710.bin
eb80a0f5cb573544cefc3db9523fcef6e74d7ebbc96a1782f7a71cbefe64c701
pdf-font-stream PDF embedded font (sfnt) at offset 0x7710 10412 bytes