Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ed3912c6e0a917…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 11:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f322978a1c63fa77071df9334ad097a SHA-1: f92fcdde8af91c231b2779c9ed026fae243e3ad1 SHA-256: 27ed3912c6e0a917feec7c61fa384ee05b14972cf6e666628efe2878d4845378
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=t+c+ka+full+form+kya+hai'. The document body also contains this URL, suggesting it is the primary lure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, including one hosted on a suspicious domain 'vajibami.glendorasleep.com'. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=t+c+ka+full+form+kya+hai
    • http://vajibami.glendorasleep.com/uploads/1/3/1/8/131857054/mesoxekege-rafurepuwaba-fenexifezujam-vowun.pdf
    • https://cdn.shopify.com/s/files/1/0452/4847/9392/files/17954076333.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/instagram_pc_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/bearing_numbers_explained.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/82306538661.pdf
    • https://cdn.shopify.com/s/files/1/0437/8433/9613/files/estrategias_de_bsqueda_de_empleo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/15434610367.pdf
    • https://cdn.shopify.com/s/files/1/0452/4598/9026/files/search_a_on_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/how_to_prepare_for_verbal_ability_and_reading_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/amd_install_manager.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/39311760642.pdf
    • https://cdn.shopify.com/s/files/1/0445/8535/3380/files/longman_academic_reading_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/50785562717.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_off00006370.bin
04601f86c5a7ff60ba085055b511f396c8fa9bdb83cffe593b94317732bd30bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6370 4636 bytes
font_01_sfnt_off00007329.bin
72ed8101600c1e6f77675dc1a0db109236068d7a3bf550548771696c7aa48e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 10012 bytes
font_02_sfnt_off0000957e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x957E 4324 bytes