Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45b8cec2250488a…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 05:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3920b93b32c5cba33122c3f9c205147f SHA-1: 399d853c488fd0b602048db482dbc6f3b848dd71 SHA-256: b45b8cec2250488a55932d171963a3b3ef3ada9591efc4fbf6f8c070d55525ea
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a GTA5 executable download, which is a common lure for malware distribution. The document body and embedded links confirm the intent to redirect users to potentially harmful content. 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.cc/wix?keyword=gta5+exe+download
    • https://cdn.shopify.com/s/files/1/0433/9856/1957/files/psicologia_autoestima.pdf
    • https://cdn.shopify.com/s/files/1/0434/8172/7129/files/17519755354.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/20880847282.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/vekafunomux.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/2410921123.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/sword_art_online_6_phantom_bullet_reki_kawahara.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/pc_play_store_for_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/node._js_interview_questions_github.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/mafebibaselunor.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/42217155892.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1932/files/92711246915.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/nagasip.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/industrial_safety_management_system.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_off00007612.bin
f4ce571c9cc2d6ebedfd2acc59224d51c95dc0ffd953826dbbacadb9214e30d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 4860 bytes
font_01_sfnt_off000086d3.bin
740f1a8dec4954423491bc172b8b03cd611eac00f39c73c4eec37b5db72e4e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D3 10512 bytes