Malicious PDF — malware analysis report

Static analysis result for SHA-256 f722dde3ad767402…

MALICIOUS

PDF

37.8 KB Created: 2020-08-29 03:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b9b386506077db972fabd6912c983b8 SHA-1: eb20a0a793199b6abc916ce2d1678a6ff3abe422 SHA-256: f722dde3ad7674028bb3df98866378776d24691b0a64c99dd01596753bebcf4e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. Another critical heuristic indicated a PDF link farm, with a large number of links hosted on 'cdn.shopify.com'. The document body contains obfuscated text and the target URL, suggesting a lure to a malicious site.

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=sunday+today+with+willie+geist
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/seiko_sportura_world_timer_chrono_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/10th_computer_science_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/41711308718.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/matricom_g-_pad_bx.pdf
    • https://cdn.shopify.com/s/files/1/0447/9323/3568/files/aprendizaje_auditivo_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4591/2727/files/uterine_malformations_radiology.pdf
    • https://cdn.shopify.com/s/files/1/0433/5842/1142/files/international_auditing_and_assurance_standards.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/assignment_abroad_times_newspaper_to.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/58884754265.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3511/files/61974195766.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/97948022047.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zukax.pdf
    • https://cdn.shopify.com/s/files/1/0468/0204/3029/files/rakig.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/bowojut.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_off00005545.bin
7e10350df315a7f0335fbe88c9fd7d825511789c4b6daf008e7da8f3b2ea6c72
pdf-font-stream PDF embedded font (sfnt) at offset 0x5545 5288 bytes
font_01_sfnt_off00006751.bin
6dc85e54f072c74c06bf87d52120049720c1771f90b95a2fb1f12893f5c13eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6751 10144 bytes