Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6e4c24cd94c70c…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 22:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f70c4782bdb561b9c84d71423780fde SHA-1: dc8d21a65492c27306e8d48d21265a1581ea357f SHA-256: 1e6e4c24cd94c70c81f0f7660be3f734fbe4f9ec4f8f947b57bdafd5d8c262a1
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is ttraff.ru. The document body itself is largely unreadable binary data, but the presence of the malicious links and the ML classifier's high confidence score strongly suggest a phishing or redirection attack. No scripts were extracted from this sample.

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=wall+cladding+sheet+material
    • http://files.newtonparkcondos.com/uploads/1/3/1/3/131379875/zamitus-dinese-kepuzal-bijuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xatet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/interview_questions_on_javascript_for_freshers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0454/7267/8054/files/jewojigokeku.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/varicella_vis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3142/files/9277387072.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/97062028071.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/bafezezisamepuliguzudukew.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/64205130352.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/fugulasivoluzerusubujugew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/questions_on_capacitors_in_series_and_parallel.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/my_guitar_shop_exercises_solutions.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_off000063e3.bin
bbbaf9938731d59da67079241ddf7cd50031f75c95ef9c39c4eafc121d05a123
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5364 bytes
font_01_sfnt_off000075f5.bin
44b344c7e8158fd01028ba630bed3ca0f4ab5576532e386e33d4f992651c1a11
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F5 10784 bytes