Malicious PDF — malware analysis report

Static analysis result for SHA-256 1888f86b560ab129…

MALICIOUS

PDF

44.9 KB Created: 2020-08-22 05:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b08e41e9f5f738829cae462496c6d6 SHA-1: 46e084e0132c29c689037b7b55e603473a4b1166 SHA-256: 1888f86b560ab1299281e35d6feee8743ca42396b1c7495f348584233f7394c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to look like a utility for exporting blocked numbers. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL and appears to be a lure for users to click the malicious link.

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/pify?keyword=export+blocked+numbers+android
    • http://files.rabbidweck.com/uploads/1/3/0/8/130814085/faeb2d524626e9.pdf
    • http://files.tepoztlaninstitute.org/uploads/1/3/1/4/131437864/rudupaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/xemitanare.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/daxizofuxujutoragozib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/35299403331.pdf
    • https://cdn.shopify.com/s/files/1/0432/2816/8359/files/pan_africanism_summary.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/chicken_breast_nutritional_information_6_oz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/quantum_state_tomography.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/medical_laboratory_technology_mukherjee.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/80370564266.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/bausch_and_lomb_microscope_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5022/0185/files/16347094709.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2728/files/36589154773.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ff9.bin
d75e77149088c950a1dff75b02c7fce0d48469bb10fd203b200dd3590564b733
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 5448 bytes
font_01_sfnt_off0000825f.bin
ea6ba49fc59d2813c04599e404722c42007a7bb97f6824fc0e00c296f8cfb09e
pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 10652 bytes