Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a23f47cc3eea31…

MALICIOUS

PDF

46.3 KB Created: 2020-09-04 07:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce35dd4951c2ebc9f941db5422aa474f SHA-1: d6379942fa8d3b2d54add44af47464296263354b SHA-256: a4a23f47cc3eea31a36175a2320a072ed99f284d59246aa23dc05aa794f347bb
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or redirector, with numerous embedded URLs pointing to external resources. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure, suggesting an attempt to lure users to harmful content. The ML classifier also strongly indicates maliciousness.

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.me/wix?keyword=essential+hypertension+in+pregnancy+pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/ronal_the_barbarian_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/50934797493.pdf
    • https://cdn.shopify.com/s/files/1/0457/7165/3276/files/photosynthesis_worksheet_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0436/4900/7769/files/mandatory_reporting_colorado_springs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/66164392665.pdf
    • https://cdn.shopify.com/s/files/1/0436/5369/3593/files/teal_elephant_baby_shower_invitation_templates.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/managing_engineering_and_technology_solution_manual.pdf
    • https://static.usrfiles.com/ugd/8ba634_8f16dfb77dab4f8b8d87a12ac3ae6785.pdf
    • https://static.usrfiles.com/ugd/c0b427_6a029fbe6b1c43ebba1a4077e8a1b601.pdf
    • https://static.usrfiles.com/ugd/eb6612_d3c290443150444681815ee493618c33.pdf
    • https://static.usrfiles.com/ugd/9cb927_6c1cf160cf844e94b48b7b9f6e9dbe3d.pdf
    • https://static.usrfiles.com/ugd/63d3ad_dd2b729c8f094d3ab3c1b9f3fb9da9d0.pdf
    • https://static.usrfiles.com/ugd/18574e_3d405b8a2c364b968c0124c41958bb6c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a47.bin
3421dcb0e082cdc008c891593b8870525d1f05516c9cb236867c780c3b83007e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A47 5264 bytes
font_01_sfnt_off00007c20.bin
aab14d3edd65b189d2b3d249e1a4c226d25b3c73fed7b7cb0ad1086d299ae9cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 9924 bytes
font_02_sfnt_off00009e02.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E02 4324 bytes